The Trovantilor Museum is an open-air museum in Costești, 7 km from Horezu, in Valcea county. They are strange, bizarre, spherical, ellipsoidal or figure-eight shaped. They range in size from a few centimetres to several metres. They are “born” in a sandy hill, they come out of a ravine and fall into a valley. These are the stones from the Costesti commune in Valcea, known scientifically as trovanti.