Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

Towering high above the neighborhood of La Candelaria, the church is easily recognizable by its distinctive red-and-white striped facade.

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

A celebration of Colombia’s premier contemporary artist.

This subterranean studio is filled with fascinating kinetic art.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The world's only museum devoted to the wonders of fluorescence.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Museum preserving torture methods from the past.

A curious collection dedicated to human and animal anatomy and pathology.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

A snapshot of the city's fascinating voodoo culture.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

An exquisite tunnel of cascading flowers.

A magical place that lets you play in and explore the world of Studio Ghibli.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A terrific purveyor of natural history objects and curios.