The castle still holds traces of the abandoned Roman fort it was built atop.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

Budapest's Communist-era statues, banished to the suburbs.

A subterranean house of worship carved right out of the bedrock.

Macabre astrological automaton clock dating to the late 1400s.

A marvel of Byzantine engineering under the streets of Istanbul.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Bangkok's men with dangerous jobs come here in search of protective talismans.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

The supreme shrine of the state.

A fantastic assortment of China's finest and most disturbing wares.

A public work of art that also provides some relief from the summer heat.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This cheese shop also houses a museum devoted to Dutch dairy.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Where the lovelorn find a home for their sentimental keepsakes.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.