Without denying the ills that affect the megalopolis of Mexico City - including violence, pollution, poverty and delinquency - you'll have great fun exploring this dazzling former lakeside city known as Tenochtitlán, besieged by the Spanish conquistadors in the 16C. Its historic centre is dotted with splendid colonial buildings. Pre-Colombian relics are on display in its museums and outdoors. Ultramodern buildings pop up like mushrooms here. Its markets are full of the hustle and bustle of ordinary folk. Mexico City is a "must" with a thousand different facets.