Los Piramides, as the Mexican call them, is the ancient leftovers of the Teotihuacan civilization. They were build around AD 100 to AD 600 in what was once the greatest city in pre-Columbian Americas with an estimated population of 200.000. The two main pyramids rise over the massive complex of smaller platforms, plazas and the Avenue of the Dead with a backdrop of mountains. The biggest pyramid is the Pyramid of the Sun (70m high), while the minor one is the Pyramid of the Moon. In these majestic settings the Teotihuacans could practice their ancient rituals which, of course, involved some human sacrificing. To this day some still believe that the pyramids contain strong energy, which explain the occasional groups of New Ages in dolphin-pattern shirts sitting in circles and holding hands.