The amount of history that can be seen, touched, and walked on in the city of Rome is astonishing. This is the Pantheon. It was originally constructed around 125 AD on top of a previous temple site. It’s dome roof is an architecturally amazing feat of 2nd century engineering. It was originally dedicated to all the gods, but in the 600s it was reestablished as a Christian temple by the Pope. Today, it is perhaps best known as being the resting place of Raphael, one of the renaissance’s greatest artist.
The fountain isn’t nearly as old. According to italianways.com, it was first built in 1575 but didn’t take its full form until it was renovated in 1711.