This woodland architectural installation acts as a camera obscura for the heavens.

This vast kitty-themed collection illustrates the history of human-cat interaction.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Abandoned railway line circling the city of Paris.

Looming communist pillar with a Czech twist.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Countless grotesque faces stare out from this eerie Prague art wall.

A Jenga-style cylindrical tower of books that appears to go on forever.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

A Gothic-style abode built to accommodate the church's three resident peacocks.

Hiroshima survivor on Riverside Drive.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

Commemorating the spot where the famous scientist fed his pigeons.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.