At low tide an innocuous-looking column of rock peeps just a few centimeters above Lake Titicaca’s surface, north of Isla del Sol. Most locals dismiss it as a natural stone column, similar to many others along the shoreline. In 1992 stone boxes containing artifacts (including several made of pure gold) were discovered at the underwater site known as Marka Pampa. In 2000 and 2004 further excavations near the site revealed a massive stone temple, winding pathways and a surrounding wall, all about 8m underwater. Although it remains unclear who was responsible for the structures, it has been postulated that they could be as much as 6000 years old. Some even say they are the lost traces of Atlantis. Investigations – and conspiracy theories – are ongoing.