This enormous censer uses a pulley system installed over 400 years ago.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Remnants of successive wars and Muslim colonialism in the 11th century.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

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

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

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

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

This chimerical bridge/tunnel appears to dead end right into the sea.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The Bristol Camera Obscura housed in an ancient windmill.

An authentic, seaworthy replica of the ship that sailed to Newfoundland in 1497.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

A 142-foot-tall Q-tip on Bristol's skyline.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.