Mexico/Mexico: Teotihuacan

At its zenith in the 1st century, Teotihuacan was the largest city in Americas and the sixth largest in the world. The sprawling city has a lot of ancient monuments, two of the biggest of which are the Pyramid of the Sun and the Pyramid of the Moon. Climbing both is a must both for experience and the views. The Avenue of the Dead runs through the entire city. Naturally, it’s a UNESCO World Heritage Site.