If it's 2500 bc it must be Cornwall.

Just a stone's throw from my brother's home on Bodmin Moor in Cornwall this gem can be found. It is a late-Neolithic burial chamber, and is in remarkably good condition considering that it is at least 4,500 years old.

There are actually lots of sub-chambers underneath where the more important members of Stone Age society were interred. The proletariat of the day were simply laid out on the big stone on the top (which weighs around 20 tons) and left for the birds, after which their bones were put underground via a chute.

This is pretty impressive stuff for people who had only access to the most primitive technology of all.

There are countless such constructions on Bodmin, along with simple stone circles, and early Christian monuments, usually dedicated to local chieftains. The latter are fairly recent additions to the Cornish landscape, being a mere thousand years old or so.

If you find yourself exploring this area, take care. There are many long-forgotten disused tin mines, some dating back to the Roman era, and people do occasionally stumble upon overgrown shafts.