The Pantheon
The Basilica of Santa Maria ad Martyres, commonly known as the Pantheon, is an ancient Roman religious building built in the 1st century B.C. on the orders of Agrippa. Damaged by several fires, it was completely rebuilt under Hadrian (early 2nd century), and transformed into a church in the 7th century. The Pantheon is the largest ancient Roman monument that has survived in a virtually intact state. It has had an enormous influence on European architecture, both secular and sacred.