The Devil Hollows is a geologic and geomorphologic nature monument. It is the only object of this kind in the Baltic States. The site is not easy to find and reach: you must go along a forest path approximately 0.5 km.
The five hollowed hills resemble craters with a surrounding dam that appeared as a result of an explosion or stroke on the ground (possible, meteorite). But it is also possible to explain the appearance of the hollows by the relief that emerged in Rundāni during the glacier time.
Excursions upon request. The start point of the trail: https://bit.ly/Velnadobe