Moray

This unique archaeological site is one of the best examples — along with Machu Picchu — of what might be called extreme Inca landscaping. Three enormous pits, each with beautifully curved sides that staircase down like the interiors of titanic flowerpots, have been carved out of the earth to depths of up to 100 feet and more. Air temperatures between the top and bottom layers can differ by more than 20 degrees, which has led some researchers to theorize that Moray was an Inca agricultural site where experiments on crops were conducted — via National Geographic