Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A floating cat sanctuary on an Amsterdam canal.

The history and future of cannabis.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This bridge was constructed from the rubble of the infamous Bastille.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

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

The curious underground history of keeping Paris clean.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

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

A museum of magic with a Sadist past.

The celebrated eyesore created by starry-eyed sweethearts.

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

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

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

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.