A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

A pair of connected skyscrapers form this symbolic gateway.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Structure built from the skulls of vanquished foes.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

Abandoned soda factory on a Cambodian roadside in a state of beautiful decay.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Derelict airplane bodies serve as both home and income for three Thai families.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Legends surround an ancient tree trunk riddled with nails for good luck.

A spherical "micro-nation" in the heart of Vienna.