The oddly shaped, steam-spewing building is now an art studio and gallery.

A small museum dedicated to the whimsical tool that turns sugar cookies into works of art.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

The only rotating bar in New Orleans has been slowly spinning since 1949.

This small museum concentrates on the juicy history of orange production in Florida.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The final resting place of the poets Shelley and Keats.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A medieval weapon rumored to have been used by the brilliant poet himself.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

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

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

A modern sliver of architecture in Roma.

An enigmatic modern marker left next to a historic Roman site.

The Pope’s secret escape route.

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

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The underground sanctuary of a mysterious ancient cult.

Architectureal fantasy quarter of Rome.

An alchemist's "magic door" stands in the middle of a Roman park.