Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Aqua white sand highlighted with fiery red rocks.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Northern Ireland's Brobdingnagian stepping stones.

The ghostly remains of an accidental sea.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The remains of Crystal Palace Great Exhibition of 1851.

An autonomous republic of Orthodox monks.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

An abandoned saucer-shaped monument in the Bulgarian mountains.

In the land of the Light Brigade stands a testament to the Cold War.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Monastery, army base, and infamous Soviet Gulag in the far Russian north.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Stunning examples of Russia's 18th-century wooden architecture.

Stalin's march toward a more modern USSR flooded a monastery, leaving a unique and extravagant nautical marker, "The Flooded Belfry."

Immortal combat in a Moscow museum.

A Marxist summer camp full of fantastical statues lies tucked away and forgotten in the forests of Moscow.