To add to the mystery, no one is actually sure when they were built. Located at several sites scattered around central and Northern India, it’s been estimated the colossal astronomy instruments were constructed as early as 1710. But is it just us, or do these structures look like they came straight off a Star Wars set?
You can find the world’s largest sundial at Jantar Mantar Observatory in Jaipur, one of the five outdoor observatories built by Maharaja Jai Singh II (this guy ↓), who ruled from 1699 to 1743.
