A mystery almost as old as Egypt's pyramids
- Heritage
- Adelina Lozanova
An underground well temple (also known as sacred pit), which is the only one of its kind found on the Balkans, is located at only 60 kilometres to the west of Sofia, hidden in the folds of the Greben Mountain. Archaeologists rank it among the most ancient cult masonry works in the Bulgarian lands and are unanimous that it is older than the Thracian megaliths of the mountains of Rhodope, Strandja and Sakar.