Tenochtitlán in 360º
Here is an absolutely incredible web site:
It is all in Spanish, but it shouldn't matter to non-Spanish speakers for the visual impact. This is an artist's conception based on ancient maps of Tenochtitlán, the ancient capital of the Aztec Empire, which you can manipulate for a 360º view of the ancient city and its surroundings. Once the site loads, and you may need to give it a few minutes (it's worth the wait!), you can center your mouse over any part of the image and left-click to change the angle of view.
You'll notice Lake Texcoco, the lake on which the island city was built, and the several causeways which connected it with various parts of the mainland.
This is probably as close as we can come now to experiencing Tenochtitlán the way Cortez did for the first time in 1521. Awesome! And the background music done by a Mexican Aztec musician is nice too!
Keep in mind that everything you see in the picture is now called México City.