This stone tower was built to protect Crete from incoming pirates.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Cold war icon and onetime "hole" in the iron curtain.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This bridge was constructed from the rubble of the infamous Bastille.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Historic medieval fortified city in southwest France.

An abstract monument to a symphonic composer.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

The Guardian of Tallinn.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

One of the newest mosques in a city filled with thousands.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.