Visočica (also known as Brdo Grad (Bosnian: Hill Town) is a hill in Bosnia and Herzegovina famous as the site of the Old town of Visoki as well the 2005 claim that it is an ancient man-made pyramid. It is 213 metres high. The idea that it constitutes an ancient artificial edifice was publicised by Houston-based expatriate Bosnian author Semir Osmanagić, but scientific investigations conclude that it is a natural geological formation known as a flatiron.