A former hen house turned curiosity cabinet displays one man's lifelong fascination with cannibalism.

Said to be one of Sweden's most haunted places, this vicarage once even attracted a ghost-busting priest.

This luxury hotel suite is located deep in the bowels of an old mine.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

An exhibition of preserved locomotives housed in a 1950s depot shows the history of Denmark's railway.

One of the largest caves in the world open to the public.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A rare chance to ride one of the few continuous elevators still in operation.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

A collection of 4,000 thimbles that's more versatile than one might imagine.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

Thousands of flowers create enchanting pink tunnels over the city streets.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

This historic stone bridge has an entire neighborhood clinging to its sides.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

"The most colorful grottoes of the world.