Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

Secret refuge and museum of the Duke of Florence.

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

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The largest and most famous wax anatomical collection anywhere in the world.

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

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

The ruined doorway is a portal to the building's turbulent and torturous past.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

An ancient octagonal weather station named for the eight Greek gods of wind.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

The skeletal white beams stand as a monument to religious dissent.

The show's fictional Korean medical camp was created in the Santa Monica hills.

This historic cemetery built for victims of the epidemics that swept Guadalajara is shrouded in macabre tales.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

The best Tiki bar in Las Vegas.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

A ghost town that held steady longer than most, but finally gave up the ghost.