Abandoned railway line circling the city of Paris.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

Macabre astrological automaton clock dating to the late 1400s.

A swing to dangle you off the very edge.

Rippling sand dunes frozen in the Arizona rock.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

An emerald-green grotto just a short trip from Austin.

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

An exquisite tunnel of cascading flowers.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A surrealist timepiece by the artist of melting clocks.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Weird wax anatomical models reside here, as do other anatomical specimens.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This massive library holds what was once the largest book collection in the world.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A part of the world's largest marsh seems to be growing bright red Martian grass.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A magically clear, blue river that seems to spring from nowhere.

These fantastically named natural pools look like something out of a Scottish myth.