6.Mexico city

Mexico City is the oldest city in North America
There are lots of cool facts about Mexico’s history, but here’s one that’s bound to surprise people. The Spanish founded Mexico City in 1521 — but actually, it’s been populated for a lot longer than that.
Before Mexico City came along, the settlement was known as Tenochtitlán, and it was the capital of the Aztec Empire. You can still see some ruins from the days of the empire around the city today, including the impressive Templo Mayor, where the Aztecs worshipped the gods of rain and war.
…and it’s sinking every year
This has to be one of the most surprising facts about Mexico! When you think about cities sinking, the one that usually comes to mind is Venice. However, despite being far inland, Mexico City is losing a pretty serious 20 inches a year.
The reason for this is simple: for centuries, urban planners have drawn the city’s water supply from underground. As the population has exploded, the underground aquifer has been drained, causing Mexico City to sink. You can even see some hints of this above the ground, with uneven streets and a remarkably bumpy airport runway.
Mexico City is in no danger of becoming the new Atlantis. Even with its loss of altitude, it remains the 8th highest capital city in the world. Politicians and city leaders are continuously searching for new, sustainable sources of water to keep the capital afloat.