Museum dedicated to "the man who moved the Earth."

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

A passage grave used in neolithic rituals.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

Jesus' footprints and the first catacombs in the world.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A stunning Victorian abbey and walled garden on a lakefront.

A hugely vast Irish landscape of barren rock that stretches for miles.

Experience what life was like in Ireland during the Viking and medieval ages.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A remarkably intact castle that once was the largest in Ireland.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This tremendous timepiece was once the largest cuckoo clock in the world.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.