Beehive Stone

Beehive stones (kaptárkő) are eroded rhyolite cones up to 13 m high with rectangular "windows" carved into them, mainly found in the Bükk region of Hungary. The stones were originally formed by volcanic activity in the Miocene era. There are over 100 of these stones in Hungary and similar objects have been found in Iran, Bulgaria and Turkey. The origin or purpose of the carved windows is unclear, but the most widely supported view is that the carved compartments were used for beekeeping.

Beehive stones to the east of Eger

One of the beehive stones in Diósd

...
Wikipedia