An 1814 castle that hosts an exhibit of "explorabilia".

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

Wander among the abandoned ruins of this once-powerful medieval town.

This ancient Irish landscape boasts hundreds of legendary ruins.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

One of the most well-preserved temples of ancient Egypt.

A single column facing the sea is all that's left of one of the most important temples of Magna Graecia.

Ancient Egyptian relief, claimed to depict an electrical light.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.