Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

A beer pipeline runs beneath Bruges.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

Hundreds of huge, centuries-old horseshoes adorn the walls of this nontraditional 12th-century castle.

Isaac Newton's former home, where the famous apple tree still stands.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

An unusual artwork dedicated to a unique man that entertained people visiting Cambridge while raising money for charity.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

The unusually large seat sits atop the base of a ruined temple.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

A fearsome dragon clings to a corner of Munich's city hall.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

Legends say that this small island was the final resting place of the Welsh saint of lovers.