Dartmoor National Park is a vast moorland in the county of Devon, in southwest England. Dartmoor ponies roam its craggy landscape, defined by forests, rivers, wetlands and tors (rock formations). Trails wind through valleys with Neolithic tombs, Bronze Age stone circles and abandoned medieval farmhouses. The area is dotted with villages, including Princetown, home to Dartmoor Prison used during the Napoleonic Wars.