Bosnian pyramid claims, Claimed ancient pyramid site near Visoko, Bosnia and Herzegovina

The site known as the Bosnian pyramids comprises several wooded hills near Visoko, whose slopes show partly triangular outlines. The elevations consist of layered conglomerate and sandstone, which has been exposed in some places.

Visoko served as the capital of medieval Bosnia, and the ruins of a fortress stand on top of Visočica hill, built over a Roman observation post that itself sat on older remains. In 2005 Semir Osmanagić began promoting the hills as ancient pyramids, and excavations started in April 2006.

Semir Osmanagić named the hills "Pyramid of the Sun", "Pyramid of the Moon", "Love", "Earth" and "Dragon". Since 2005 the area has drawn pseudoscience enthusiasts, and the Ravne tunnels have become New Age pilgrimage sites; volunteers build botanical gardens and meditation sessions are held. The Serbian tennis player Novak Đoković visited from 2020, calling them "energy pyramids".

Several paths lead to the excavation sites and through the tunnel system, with sturdy shoes recommended for the uneven trails. Most areas are walkable in dry weather, but slopes can turn slippery after rain.

The Ravne tunnel extends for several hundred meters beneath the hills and shows smooth walls interpreted by supporters as evidence of human work. Geologists explain these surfaces through natural erosion along rock joints.