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.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Cathedral carved out of salt, located a mile below the earth's surface.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Moscow's imposing monument to the Space Age.

Museum celebrating the achievements of the Soviet space program.

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.