This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

Fortified medieval tower house with lovely roof garden.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

The secret medieval communication system will whisk your words above the noise of the crowd.

The mark of the Devil's horns on a marble column in Milan.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

The only museum with its curator—and her pets—buried inside.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Go inside to really appreciate this 500-year-old technological masterpiece.