Mexico City is one of the largest and most populated cities in the world. Originally built by the Aztecs in 1325 on the dry bed of Lake Texcoco, it is surrounded on three sides by tall mountains and volcanoes and sits in the Valley of Mexico, also known as the Valley of the Damned. Mexico City today is a great travel destination offering a wealth of culture and history in the shape of world-class museums, great archaeological buildings, idyllic parks and a thriving night-life.