Home to the famous Oracle of Delphi, this mountain sanctuary was the holiest site in Ancient Greece. It was believed to be the center of the world, marked by the sacred Omphalos stone.

This iconic door that leads nowhere is the entrance to an unfinished Temple of Apollo that faces exactly toward Delos, the god's birthplace. It was begun about 530 BC.

The famous Temple of Athena Parthenos, built in 440 BC, crowns the Acropolis. It was a major sacred site and is considered one of the finest examples of Greek architecture anywhere.

Located 48 miles west of Athens, Corinth was an important Greek city that also played a prominent role in the life of the Apostle Paul. Ruins include Temples of Apollo, Aphrodite and Octavia.

This 11th-century Byzantine monastery and World Heritage Site is famed for the golden mosaics that cover its walls.

This fine Doric temple was built just two years before the Parthenon, dedicated to the god of volcanoes and metalworking.

The Agia Sophia is the largest and most famous Byzantine church in Thessaloniki, Greece. Built in the 8th century, it was modeled after the more famous 6th-century version in Istanbul.

Overlooking the sea from atop the sheer cliffs of Cape Sounion, the Temple of Poseidon was built in 444 BC for the god of the sea.