Mexico City is one of the worst places in the world when it comes to geography. Despite its rank as the sixth-largest city globally and the largest city in Mexico, it was constructed in one of the most unfavorable locations possible. The first thing to know is that the city is sinking at an alarming rate. On average, the city sinks about 20 inches per year, and in some places, even up to 1.5 feet per year. Currently, it is forecasted that by the end of the 21st century, sections of Mexico City will be 65 feet below its current elevation, with some parts likely to sink upwards of 100 feet.