The oldest operating pharmacy in the world features 800-year-old recipes.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The oldest botanical garden in the world that technically isn't the oldest.

This crumbling industrial fortress has attracted daredevils, filmmakers, and historians.

A swaggering, monumental souvenir of the most extravagant party Montreal’s ever thrown.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

From lefty Jewish gathering site to hip cultural site in just 80 years.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

The house where the writer spent his formative years.

The tunnel under the Capitol Building where Congress takes out its trash.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Building owners can take out tiles for free at this repository for historic building materials.

After Sierra Leone's railways shut down in 1974, a collection of engines and other artifacts spent decades hidden away in this old workshop—now a museum.

The little-known second castle that William the Conqueror built in York.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

This tangled English forest looks like something right out of a fairytale.

This racially troublesome eatery thought a new coat of paint could erase its offensive connotations.

William Faulkner kept his beloved estate wild and untamed.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

One of the greatest boxers and humanitarians to ever live chose his hometown as his final resting place.

This Canadian city is actually two-in-one, even if they only respect the timezone of one side.

One of Ireland's most infamous prisons for rebels including men, women and children.

The juke joint where legendary soul artists ate, drank, and made merry.