The hallucinogenic center of the ancient world.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

At 207 feet, one of the world's longest continuous escalators.

Home to items never before seen by the public.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A small but immensely extravagant palace built by the "Night King."

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

A whimsical bridge adorned with decorative dragons.

Romania's triumphal arch looks out over Bucharest.

Structure built from the skulls of vanquished foes.

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

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

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

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

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

Where the lovelorn find a home for their sentimental keepsakes.

A miniature train-ride through Slovenia's largest cave system.

The "dragon babies" of southeastern Europe.