Teotihuacan, Mexico
A powerful city which legend claims to be the birthplace of time itself, Teotihuacan had an influence which spread through the Mesoamerican region. Although a strong base of political power and cultural influence, the city interesting lacked any structural defences or fortifications. The city's trade specialised in pottery, jewellery and art with murals in particular being popular. Archaeologists have deduced much history of this city from the murals that were painted, many of which were of an ideological nature. The city also appears to have been constructed with an integrated drainage system which demonstrates the advancement in their urban planning. The city declined in the 7th or 8th century AD after the destruction of monuments along the Street of the Dead by either rioters fuelled by internal unrest, or external invaders. The site today is designated a UNESCO World Heritage site, and is one of the most visited archaeological sites in Mexico.