Key Points / Quick Summary

• Milecastle 39 sits at the dramatic dip of Sycamore Gap, one of the most photographed locations on Hadrian’s Wall Path
• The site featured in the 1991 film Robin Hood: Prince of Thieves, cementing its place in popular culture
• Located between Steel Rigg and Housesteads Roman Fort, this section offers some of the best-preserved Wall remains in Northumberland
• The iconic sycamore tree was tragically felled in September 2023, but the Gap remains a powerful landscape feature
• Walkers can explore well-preserved Roman remains including the milecastle structure and Turret 38A nearby
• This stretch forms part of the most spectacular day on any self-guided walking holiday along Hadrian’s Wall

Main Article

What Is Milecastle 39?

Milecastle 39 represents one of the most scenically positioned fortifications along Hadrian’s Wall. Built by the Romans nearly 2,000 years ago, this small garrison housed around 20 soldiers whose duty was to control movement through the Wall and provide a lookout post across the Northumberland landscape.

The milecastle sits precisely at Sycamore Gap, a dramatic natural dip in the Whin Sill escarpment where the Wall drops sharply before climbing again. This geographical feature created both a defensive challenge for the Romans and one of Britain’s most memorable walking experiences for modern visitors.

Unlike some milecastles along the Wall that have been reduced to grassy mounds, Milecastle 39 retains substantial stonework. Walkers can clearly identify the gateway, walls, and internal buildings, making it an excellent example for understanding how these Roman structures functioned.

The Sycamore Gap Story

For decades, a solitary sycamore tree stood within the Gap, framing photographs and becoming arguably the most famous tree in England. The tree gained international recognition after appearing in the 1991 film Robin Hood: Prince of Thieves, and was subsequently voted English Tree of the Year in 2016.

On 28th September 2023, the tree was deliberately felled in an act of vandalism that shocked the nation. The loss was felt deeply by walkers, photographers, and local communities who had cherished this natural landmark for generations.

However, Sycamore Gap remains a profoundly moving location. The sweeping dip in the landscape, the Roman remains, and the raw beauty of the Whin Sill crags continue to draw visitors. National Trust and Northumberland National Park Authority are carefully managing the site, with efforts underway to propagate saplings from the original tree.

The story serves as a reminder that whilst individual features may change, the enduring power of Hadrian’s Wall and the Northumberland landscape transcends any single element.

Walking Through Milecastle 39 on the Hadrian’s Wall Path

The Classic Steel Rigg to Housesteads Section

Most walkers encounter Milecastle 39 as part of the Steel Rigg to Housesteads stretch, widely regarded as the finest section of the entire 84-mile Hadrian’s Wall Path. This 4-mile segment delivers everything that makes walking in Northumberland special: dramatic landscapes, well-preserved Roman archaeology, and a genuine sense of achievement.

Starting from the Steel Rigg car park, the path climbs steadily westward along the Wall, passing Milecastle 38 before reaching Sycamore Gap. The descent into the Gap and subsequent climb out tests the legs but rewards with spectacular views across the Northumbrian countryside.

Key landmarks on this section:

• Peel Crags and Highshield Crags offering 360-degree panoramas
• Turret 38A and 39A, well-preserved watchtowers
• Castle Nick, the Gap’s proper geological name
• Milecastle 39 with interpretive panels explaining Roman military life
• Continuing eastward to Housesteads Roman Fort, the best-preserved fort along the Wall

Walking Eastward from Once Brewed

For those basing themselves in Once Brewed or planning a self-guided walking holiday with baggage transfer, the walk to Milecastle 39 and beyond towards Housesteads makes a perfect half-day route. The distance from Once Brewed to Housesteads Fort measures approximately 5 miles, allowing time to explore the archaeological sites properly.

The terrain involves steep ascents and descents along the Whin Sill, with some exposed sections. In poor weather, the path can become slippery, and wind exposure should not be underestimated.

Multi-Day Hadrian’s Wall Walking Holidays

Milecastle 39 typically features on Day 3 or 4 of a full coast-to-coast Hadrian’s Wall Path walking holiday. Most self-guided itineraries position overnight accommodation in Twice Brewed or Once Brewed, placing walkers within easy reach of this spectacular section.

Seven-day itineraries often combine this with an exploration of Housesteads Roman Fort and continue eastward towards Chollerford. The ability to walk with just a daypack, whilst luggage transfers between accommodations, transforms the experience on this challenging terrain.

Understanding the Roman History

Why Build a Milecastle Here?

The Romans constructed milecastles at intervals of approximately one Roman mile (1,620 yards) along the entire length of Hadrian’s Wall. Milecastle 39’s position at Sycamore Gap initially appears odd—why place a gateway at the lowest, most vulnerable point in the landscape?

The answer lies in Roman military strategy. Milecastles served as controlled crossing points, and the Gap represented a natural route through the Wall. By positioning a fortified gateway here, Romans could regulate traffic and levy taxes on goods whilst maintaining surveillance over the surrounding area.

Archaeological evidence suggests Milecastle 39 was built during the primary construction phase under Emperor Hadrian around AD 122–128. The structure measures approximately 18 metres by 15 metres internally, with walls that originally stood 4–5 metres high.

Life at Milecastle 39

The garrison would have comprised soldiers from auxiliary units rather than legionaries. These men, often recruited from various corners of the Roman Empire, endured harsh Northumberland winters far from home.

Their duties included:

• Manning the north and south gates through the Wall
• Patrolling the Wall and surrounding area
• Collecting tolls from travellers and merchants
• Sending signals to neighbouring installations using fire or flags
• Maintaining the structure and adjacent Wall sections

Excavations have revealed evidence of barracks, a hearth, and domestic items that bring these soldiers’ daily existence into focus. Standing among the ruins today, walkers gain genuine insight into Roman frontier life.

Practical Information for Walkers

Getting There

By car: The closest parking is at Steel Rigg car park (pay and display), located just off the B6318 Military Road. From here, it’s a 1.5-mile walk westward to Milecastle 39.

By public transport: The AD122 Hadrian’s Wall bus service operates between April and October, stopping at Steel Rigg and Once Brewed. This seasonal bus connects key sites along the Wall, making car-free walking holidays entirely feasible.

On foot: Milecastle 39 lies on the Hadrian’s Wall Path National Trail, accessible from either direction.

Best Time to Visit

Northumberland’s weather can be unpredictable throughout the year. However, each season offers distinct advantages:

Spring (April–May): Wildflowers appear along the crags, and the landscape bursts into green. Lambing season adds pastoral charm.

Summer (June–August): Longest daylight hours and warmest temperatures, though expect more visitors. The AD122 bus operates during this period.

Autumn (September–October): Fewer walkers, stunning autumn colours, and often crisp, clear conditions perfect for photography.

What to Bring

The exposed nature of this section demands proper preparation:

• Sturdy walking boots with good ankle support and grip
• Waterproof jacket and trousers (weather changes rapidly)
• Layers for temperature regulation
• Walking poles helpful on steep descents
• Water and snacks (no facilities between Steel Rigg and Housesteads)
• Ordnance Survey map (Explorer OL43) or GPS device
• Fully charged mobile phone (signal can be patchy)

Walking Difficulty

This section rates as moderate to challenging. The cumulative ascent and descent along the Whin Sill crags requires reasonable fitness levels. The path is well-maintained but involves steep stone steps, rocky terrain, and narrow sections along cliff edges.

Allow 2–3 hours for the Steel Rigg to Housesteads walk, longer if stopping to explore archaeological sites or enjoy the views.

Nearby Attractions

Housesteads Roman Fort

Just 1.5 miles east of Milecastle 39, Housesteads (Vercovicium) is the most complete Roman fort in Britain. Managed by English Heritage, the site includes visible remains of barracks, granaries, a hospital, and the famous communal latrines.

The views from Housesteads rival those from Sycamore Gap, and the excellent visitor centre provides essential context for understanding Hadrian’s Wall.

Vindolanda

Located 2 miles south of Once Brewed, Vindolanda predates Hadrian’s Wall and offers extraordinary insights into Roman Britain. The ongoing archaeological excavations regularly uncover new finds, including the famous Vindolanda writing tablets—the oldest surviving handwritten documents in Britain.

Many self-guided walking holidays along Hadrian’s Wall incorporate a rest day or afternoon visit to Vindolanda, as it complements the Wall experience perfectly.

The Sill National Landscape Discovery Centre

Situated at Once Brewed, The Sill provides exhibitions about Hadrian’s Wall, the Northumberland landscape, and local wildlife. The centre includes a café, shop, and youth hostel, making it a useful base or stopping point.

Accommodation Options for Self-Guided Walkers

The Once Brewed and Twice Brewed area offers the most convenient accommodation for exploring Milecastle 39:

Once Brewed Youth Hostel (The Sill): Modern facilities with private rooms and dormitories, on-site café, and stunning views.

Twice Brewed Inn: Traditional pub with comfortable rooms, excellent food, and a welcoming atmosphere for tired walkers.

Vallum Lodge: Guest house offering B&B accommodation with hearty breakfasts.

Camping: Winshields Campsite near Once Brewed provides basic facilities for those carrying tents.

For those walking the entire Hadrian’s Wall Path on a self-guided basis, baggage transfer services collect luggage each morning and deliver it to the next accommodation, allowing walkers to tackle this challenging section carrying only a light daypack.

Conservation and Respect

Hadrian’s Wall is a UNESCO World Heritage Site and a Scheduled Ancient Monument. Visitors have a responsibility to protect this irreplaceable heritage:

• Stay on designated paths to prevent erosion
• Do not climb on Wall remains or remove stones
• Respect livestock and close gates
• Take all litter home
• Keep dogs on leads near livestock and ground-nesting birds
• Follow the Countryside Code

The area around Milecastle 39 receives intense visitor pressure. By treading carefully and respecting the landscape, walkers help preserve this special place for future generations.

Planning a Self-Guided Walking Holiday

Milecastle 39 and Sycamore Gap represent the highlight of most Hadrian’s Wall walking holidays. Whether tackling the full 84-mile coast-to-coast route or focusing on the central section’s best bits, this area delivers unforgettable experiences.

Self-guided walking holidays offer the perfect balance of independence and support. With accommodation pre-booked, luggage transferred daily, and detailed route notes provided, walkers can focus on enjoying Northumberland’s landscapes and Roman heritage without logistical stress.

The flexibility to walk at your own pace, stop for photographs, explore archaeological sites thoroughly, and adjust daily distances to suit fitness levels makes self-guided walking ideal for this route.

Most operators offer various itinerary lengths, from short breaks covering just the central highlights to full week-long coast-to-coast adventures. The central section including Milecastle 39 can be walked comfortably over 2–3 days, allowing time to visit Vindolanda and Housesteads.

Frequently Asked Questions

Is Milecastle 39 the same as Sycamore Gap?

Yes, Milecastle 39 is located at Sycamore Gap. The Gap refers to the dramatic dip in the landscape where the milecastle was built, also known geologically as Castle Nick. The famous sycamore tree that stood here was felled in September 2023, but the milecastle remains and the Gap itself continues to be one of the most spectacular features along Hadrian’s Wall Path.

How difficult is the walk to Milecastle 39?

The walk rates as moderate to challenging due to steep ascents and descents along the Whin Sill escarpment. From Steel Rigg car park, it’s approximately 1.5 miles with significant elevation changes. The path is well-maintained but involves rocky terrain and exposed sections. Reasonable fitness and proper walking boots are essential. Most walkers find it manageable but should allow extra time for the demanding terrain.

Can I visit Milecastle 39 without walking the entire Hadrian’s Wall Path?

Absolutely. The easiest approach is parking at Steel Rigg car park and walking 1.5 miles westward along the Wall. This makes an excellent half-day walk, and you can continue to Housesteads Fort if desired. During summer months, the AD122 bus service allows you to create linear walks without returning to your car, making short visits very practical.

What happened to the Sycamore Gap tree?

The iconic sycamore tree was deliberately felled overnight on 28th September 2023 in an act of vandalism. The tree, which had stood for around 200 years and featured in Robin Hood: Prince of Thieves, was beloved nationally. The National Trust has preserved sections of the trunk and is propagating saplings. Despite the tree’s loss, Sycamore Gap remains a powerful and beautiful location worth visiting.

Are there facilities at Milecastle 39?

No facilities exist at Milecastle 39 itself—it’s an exposed archaeological site in open countryside. The nearest toilets, café, and visitor centre are at The Sill in Once Brewed (2 miles away) or at Housesteads Roman Fort (1.5 miles east). Walkers should carry water, snacks, and appropriate clothing. Mobile phone signal can be unreliable in this area.

When is the best time to visit Milecastle 39?

April to October offers the most reliable weather and longest daylight hours, with the AD122 bus operating during this period. Early morning or late afternoon provides the best light for photography and fewer visitors. Autumn offers stunning colours and clearer conditions. Winter visits are possible but require winter walking experience due to ice and snow on steep sections. Weekdays are generally quieter than weekends.