This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

1513 Turkish world map, full of European state secrets and snarky commentary.

This indoor ski resort has a mountain contained inside a mall.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

This astronomical clock is the second oldest in England.

This wooden chair dates possibly back to the 15th century, and commemorates a local legend.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A stunning Victorian abbey and walled garden on a lakefront.

Village situated on a narrow volcanic escarpment.

This cave was the former seat of power for two brothers who ruled together as kings.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The seat of the Mantua bishop holds many secrets within its walls.

One of the largest squares in Europe contains an entire artificial island.

One of the best-preserved modern fortresses was part of a pivotal moment in the Italian Risorgimento.

This weird, elephant-shaped rock also hosts two ancient tombs.

The sacristy of this church contains remains and relics of members of the Aragonese royal family.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.