3,000 market stands in five former Zeppelin hangars.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

A black cat protests the City Guild in Riga's Old Town.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Humble beginnings for one of the world's most famous scientists.

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

A unique collection of Soviet military artifacts lies hidden away in a disused train, in the unrecognized Eastern European republic of Transnistria.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

The largest catacomb system in the world.

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

Museum dedicated to the terror regimes of Hungary.

Budapest's Communist-era statues, banished to the suburbs.

An ancient knight and a symbol of the city's freedom.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

An ethereal glowing blue ocean cave in Croatia.

A musical instrument played by the sea.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The original goat tower, the one that started it all.

One of the tallest buildings in Africa provides a great view of Johannesburg's unique geography.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Copenhagen's celebrated theme park and gardens.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.