You have to know where to look in this rather ordinary-looking square to find hints of its past as a dissidents' cemetery.

With its vast selection of books, comics, and records, this nearly 70-year-old open-air market always rewards the patient browser.

A bright little alley in La Boca is a part of tango history.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

The gorgeous murals at this open-air museum form the largest street art collective in Chile.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Architectural monsters are devouring this palace's every door and window.

The underground sanctuary of a mysterious ancient cult.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

19th century cemetery hidden in Brooklyn's Prospect Park.

This 17th-century Portuguese fort now houses a nautical museum.

This enormous gold Buddha statue was hidden inside a stucco decoy for centuries.

Almost too short to be an actual street, this stretch of road maintains a unique moniker.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

This artificial lake surrounded by Brutalist architecture served as a stand-in for futuristic Britain in Stanley Kubrick's 'A Clockwork Orange.'

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.