Lavish royal estate punctuated with heated greenhouses.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This ghost town in Belgium will lose its street art when it ceases to exist.

These warring psychedelic crags commemorate an unsuccessful military operation.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

A former imperial sea-fortress and Soviet prison.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A subterranean house of worship carved right out of the bedrock.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

An artist's mausoleum with a haunting echo.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

Collection of nearly 500 concrete figures sculpted by the late Veijo Rönkkönen.

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

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

It took over half a century but a Russian monument to a famous and tragic space pup finally stands in Moscow.

Immortal combat in a Moscow museum.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

Serving you alcohol with a side of insanity. Also, costumes!

A 19th-century subterranean reservoir repurposed as a contemporary art cave.