Sloth rehabilitation center in the jungle of Costa Rica.

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

Notorious artist squat renovated into legal studios.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

Paris' linguistic guide to the international language of, yes, love.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This black shoreline is made up of exploded lava particles.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An enormous, inside-out glass globe built in 1935.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Copenhagen's celebrated theme park and gardens.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Theme park featuring miniature replicas of European monuments.

A little sculpture with a large wardrobe.