Bosnian 'Pyramid of the Sun' (Visočica Hill)

Semir Osmanagić — who holds a doctorate in sociology from the University of Sarajevo and a background in Houston-based metalworking businesses — argues that Visočica's geometry is too regular to be natural: he cites its roughly triangular faces, claimed orientation to cosmic north with high precision, and slopes of about 45 degrees. His foundation's excavations, he says, have revealed man-made concrete-like conglomerate blocks superior to modern concrete, paved causeways, and construction layers. Organic material found in the Ravne tunnel complex and above alleged structural layers has, he claims, yielded radiocarbon dates suggesting construction more than 12,000 — and in some statements over 30,000 — years ago, which would predate all known civilisation.

Osmanagić further claims the pyramid emits an 'energy beam' of electromagnetic radiation around 28 kHz from its apex, that the Ravne tunnels concentrate negative ions with healing properties, and that the complex was built by an advanced prehistoric culture, possibly linked in his earlier books to Atlantis and even extraterrestrial visitors. The project frames academic rejection as establishment gatekeeping, and has attracted celebrity support — most famously tennis champion Novak Djokovic, who visited in 2020 and praised the site's 'energy'.

Critics have tested the key claims: the 'concrete' matches natural conglomerate cemented by carbonate; the hill's orientation and angles are not uniform once surveyed fully; the energy-beam measurements have never been independently replicated or published in a physics venue; and dated organic material in natural sediments does not date construction. Mainstream observers do concede two things: the flatiron really is unusually photogenic and pyramid-like, and the project — hoax or not — has been a genuine boon to Visoko's tourism economy.