Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

Ice cream stand, snack bar, and time capsule of milk conveyance.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

A men’s restroom became a sandwich shop.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

This impressive Boston holy house is the American mecca for Christian scientists.

An enormous, inside-out glass globe built in 1935.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

Peru’s only toy museum houses everything from pre-Inca whistles to lead soldiers and terrifying dolls.

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The only castle in North America to ever house European sovereigns.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

The second largest in the world, this massive underground void has its own subway.

A mega theme park-wax museum mélange containing all things biblical.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

The (usually) serene burial place of the world's most notorious drug lord.

In the heart of Medellín, an artsy urban complex sets the stage for demonstrations and protests.

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.