Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

This historic street in Quito is known for its seven stone crosses—and one presidential assassination.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

Quito's historic, main square dates back to the 16th century.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

Located outside Medellín, this Colombian park focuses on conservation and sustainability.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

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

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

A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

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

A dangling church built over a Colombian gorge.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Notorious artist squat renovated into legal studios.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.