Grimes Graves
Grimes Graves is a fascinating prehistoric site located in the heart of the Thetford Forest in Norfolk. Unlike what the name might suggest, it isn’t a burial ground; it is actually the only Neolithic flint mine open to the public in Great Britain.
What to See and Do
The main draw here is the chance to descend a 9-metre (30-foot) ladder into a deep mining shaft that was excavated by hand over 4,000 years ago. Once at the bottom, you can see the jet-black flint seams and the primitive tool marks left by prehistoric miners using antlers as picks.
Above ground, the landscape is surreal—covered in hundreds of grassy hollows and mounds that look like a lunar surface. You can explore the visitor centre, which explains the site’s history and displays original tools, or enjoy the peaceful, rolling landscape surrounding the pits.
How Long to Spend
Most visitors spend about 1.5 to 2 hours here. This gives you enough time to go down the mine, browse the exhibition, and walk around the grassy pits.
Who It’s For
- Best Suited For: History buffs, archaeology fans, and adventurous families. It’s perfect for anyone who loves a “hidden” or unusual historical site.
- Suitability: It’s great for older children who will find the descent into the earth exciting.
- Who Might Be Bored: Very young children might find the historical context a bit dry, and the site doesn’t have the typical “action” of a theme park or castle. Those with claustrophobia or mobility issues may be disappointed, as they won’t be able to enter the mine shaft.
The Best Time to Visit
To avoid crowds, weekday mornings are your best bet. Because much of the site is outdoors and the descent involves a ladder, dry weather is much better for comfort and safety. The site feels particularly atmospheric on a clear, sunny day when the shadows highlight the dips in the ground.
Unique Features
What makes this place truly unique is its age and purpose. Most ancient sites are for the dead (tombs) or the gods (Stonehenge), but this was a massive industrial workplace. Standing at the bottom of the pit, you are literally standing in a workspace from thousands of years ago.
Budget Tips and Memberships
- English Heritage: The site is managed by English Heritage. If you are a member, entry is free. For families who plan on visiting a few historical sites in a year, an annual membership usually pays for itself quickly.
- Vouchers: Look out for Tesco Clubcard deals, as these can often be converted into English Heritage tokens.
- Blue Light: Discounts are often available for Blue Light Card holders, so it’s worth checking your app before booking.
- Picnics: There isn’t a full restaurant on-site, so bringing your own food and eating at the picnic tables is the most cost-effective way to enjoy the day.
Visitor Advice
- Clothing: Wear sturdy, closed-toe shoes. You are climbing a ladder and walking on uneven ground; sandals or heels are not allowed in the mine. Bring a jacket, as it stays cool underground even in summer.
- Restrictions: There is a height restriction for the mine (usually children must be over 1.1 metres tall) to ensure they can safely navigate the ladder.
- Parking: There is a dedicated car park on-site which is generally straightforward to use.
Nearby Attractions
If you want to make a full day of it, you are right in the middle of Thetford Forest. You can head to High Lodge for mountain biking and forest trails, or visit the nearby Lynford Arboretum for a beautiful, quiet walk. The town of Thetford is close by for a variety of cafes, bars, and local pubs to refuel after your underground adventure.