The Bosnian pyramids are a pseudo-archaeological claim promoted by author Semir Osmanagić, that a cluster of natural hills in central Bosnia and Herzegovina are the largest human-made ancient pyramids on Earth. The hills are located near the town of Visoko, northwest of Sarajevo. Visočica hill, where the old town of Visoki was once sited, came to international attention in October 2005, following a news-media campaign by Osmanagić and his supporters.