A church of bones, decorated with 40,000 human skeletons.

Macabre astrological automaton clock dating to the late 1400s.

The celebrated eyesore created by starry-eyed sweethearts.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

Breathtaking and huge 430 year old maps of Italy.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The bears of Bern have been a city highlight for over 500 years.

Flamboyant architecture from the turn of 20th century.

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.