Breathtaking and huge 430 year old maps of Italy.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This underground transport hub doubles as an art gallery.

The deepest metro station in the world.

This derelict superstructure was a very important warning system for the Soviet military.

340-foot statue built to honour the Heroes of the Soviet Union.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chornobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This bell stars in a tragic love tale and is said to make wishes come true.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An underground city of salt.

An unmistakable facial pareidolia in the Julian Alps also includes a fantastic tale.

This one-time health resort was used by aristocrats around the world.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.