A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

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

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

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.

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

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

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

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

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Travel back in time at a Moroccan-inspired restaurant that was the height of glamor in the 1970s.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

A modern-day Lascaux cave underneath Paris.

This Parisian gem is one of the most incredible ethnographic museums in the world.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

These large-scale reproductions of Mario Sanchez’s colorful pictures and murals feel like a walk around a small movie set, and also lead you down an imaginary “street” of past decades.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

A monument celebrating the idea of reaching inaccessible places.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.

An underwater statue of Christ blesses the depths off Key Largo.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.