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

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

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

This stunning mass of ice spans 121 square miles and is still growing.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

An unexpected desert oasis in South America.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

Sitting empty in a lonely Canadian field is a century-old stone bunker sometimes called "One Man's Castle."

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

Try the alligator at this fondue spot, which has been catering to "lovers and hedonists" since 1967.

More than a century old, this trading post resides in the Navajo Nation.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A massive Montreal stadium that has seen nothing but trouble since its inception.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A wacky, UFO-shaped house in a suburban neighborhood.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

This unique bridge has been a staple across the Saskatchewan River Valley for more than 100 years.

This is one of the last remaining theatres in Canada to feature an Art Moderne architectural style.

Canadian centennial project designed to gather information about UFOs.