This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

A modern mechanical planetary system, part of a 10,000 year clock.

Canyon walls shrouded in ferns.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The private clubhouse for the members of the Academy of Magical Arts.

The rocks in this arid basin leave trails of movement behind them.

This little-known relic crypt holds stolen parts of a Roman Empress.

A subterranean shelter remains intact under a busy Paris railway station.

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

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

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

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

A museum of carnival attractions where you are invited to ride the rides.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

France's most famous cemetery, with some of its most curious tombs.

The oldest stone house in Paris was built by its most famous alchemist.

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

A surrealist timepiece by the artist of melting clocks.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.