Coordinates: 43°58′37″N 18°10′34″E / 43.97694°N 18.17611°E
The 'Bosnian pyramid complex' is a debunked pseudoarchaeological notion which has been promoted by author and businessman Semir Osmanagić. He claims that a cluster of natural hills in central Bosnia and Herzegovina are the largest human-made ancient pyramids on Earth. Osmanagić opened excavations in 2006 which have since reshaped one of the hills, making it look like a stepped pyramid.
Direct study of the site by geologists, archeologists and other scientists have demonstrated that the hills are natural formations known as flatirons and that there are no signs of human construction involved. The European Association of Archaeologists has condemned the so-called 'Bosnian pyramids' as a "cruel hoax". Many scholars have noted that the claims are used for serious ideological, political and economical gains in Bosnia.
Despite being completely disowned by the scientific community, Osmanagić was still pursuing his project in 2017.
The hills are located near the town of Visoko, northwest of Sarajevo. The town was Bosnia's capital during the Middle Ages, and ruins of a medieval fortress are located atop Visočica hill. The fortress was built over an old Roman Empire observation post, which in turn was constructed over the ruins of an ancient settlement. The hills themselves, which form striking pyramidal shapes, are a type known as flatirons. Archaeological geologist Paul Heinrich of Louisiana State University has pointed out that these formations are common throughout the world, giving the example of the so-called 'Russian Twin Pyramids' in Vladivostok.