Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

New York City's smallest piece of private property.

New York's oldest magic store.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

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

The world's smallest movie theater runs on solar power—an attraction in itself.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

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

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.

France's national museum of scientific and industrial instruments.

Notorious artist squat renovated into legal studios.

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

A museum of magic with a Sadist past.

The personal library of the founder of modern neurology is open to visitors.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

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

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