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Photo: Eclipsa, CC BY-SA 3.0 via Wikimedia Commons
Large, open karst cave (the ceiling reaches more than 60 m in height in some places), named after the nearby village of Devetaki ('Деветаки', Devetashkata peshtera = "the cave of Devetaki"). It was inhabited by cave people during the neolithic age, then used by the military to store fuel during the Cold War, now it's a protected habitat of endangered birds and bats. Some scenes of the 2012 action movie The Expendables 2 were filmed there.
Devetàshka Cave is a large karst cave around 15 km (9.3 mi) southwest of Letnitsa and 15 km (9.3 mi) northeast of Lovech, near the village of Devetaki on the east bank of the river Osam, in Bulgaria. The site was continuously occupied by paleo-humans for tens of thousands of years, served as a shelter for a variety of animal species during extensive periods and is now home to nearly 30,000 bats.
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Къкринското ханче, Kakrinskoto hanche
A tiny museum, one of the (more than) 100 National Tourist Sites of Bulgaria, though it's more of a patriotic pilgrimage site. The building is a recreation rebuilt on the foundations of the original inn in the 1930s.