The deepest metro station in the world.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

When you've got to go, you've got to go.

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

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

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

This attraction was abandoned after the Chernobyl disaster.

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

Breathtaking and huge 430 year old maps of Italy.

Vast stretch of tide-pools with a unique Moroccan charm.

Singapore's landscaping project is home to 18 incredible Supertrees.

Five miles of underground river link lake to ocean.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

Bohol's mysterious brown hills.

The largest tea plantation in Southeast Asia supplies gorgeous vistas alongside tea for the surrounding countries.

This dangerous-looking suspension bridge may have been too unstable to remain open.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Time has stopped at the house where Gandhi died.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.