The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This modest marker near Notre Dame identifies the very center of Paris.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Once the path of a railway tunnel, now home to thousands of glowing insects.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

1513 Turkish world map, full of European state secrets and snarky commentary.

A marvel of Byzantine engineering under the streets of Istanbul.

Europe's official "zero-level," the equator of elevation.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

The “Coin Cabinet of Dresden” houses a collection of over 300,000 numismatic artifacts, one of the largest of its kind in Europe.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

Thousands of well-dressed mummies below a monastery.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

Come for the bread-themed puppet show, stay for the buffet.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.