Dartmoor has the highest concentration of neolithic monuments in Western Europe. Stone circles, stone rows (the longest stone rows in the world IIRC), burial sites, enclosures & villages with hut circles. There's a massive amount of ancient industrial archaeology, with tin, copper & lead mines dating back into pre-history. There are ancient trackways, a good number that were of some religious significance, either as part of a pilgrimage route, or as routes linking abbeys & monasteries - there are rather a lot of ancient marker posts, including stone crosses. There are large warrens, created to house rabbits, as a food source for the miners - mostly medieval or later, but giving Dartmoor lots of rabbits, and by consequence, the highest concentration of foxes in Britain.
Apart from the obvious rocky outcrops (Tors), Dartmoor has rivers, blanket bogs (crossing them can be an unnerving experience; as you walk, the ground moves under your feet. Jump up & down, and you can see the ground around you move. Be careful though, because under the layer of peat you're walking on, is water, very deep water, more than enough to swallow a Dartmoor pony, or you), mires, & streams, and ancient crossings for them, such as clapper bridges, or peat cuttings (routes through the peat, cut to enable safe & easier passage).
Wildlife includes otters, hares, badgers, stoats, weasels, foxes, deer, dormice, grouse (on the south moor), fogs, toads, lizards, adders, grass snakes, ravens, buzzards, peregrine falcons, dunlin, snipe, plovers, dippers, gooseanders, herons, kingfishers, and dozens of other bird species. The fir/pine plantations also have crossbills, goldcrests, and there is rumour of pine martens too. The rivers are home to eels, and a range of freshwater fish, as well as trout & salmon. For further info on wildlife habitats to be found here -
clickyIn addition, a wide variety of moorland plants, some globally rare insects (e.g. blue ground beetle & bog hoverfly), including butterflies such as the marsh fritillary.
And if that lot doesn't generate any interest, you might need to see your medical practitioner, in case you're dead & didn't realise it :-)