Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Thousands of glyphs created by an unknown culture decorate the rock formations of this canyon.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

This outsider art paradise is filled with dinosaur sculptures crafted from recycled machinery.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

A house carved into a rock in the 1940s.

One of the oldest masonic museums in Paris.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

A surrealist timepiece by the artist of melting clocks.

The narrowest street in Paris.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

What looks like a normal building is really a hollow facade hiding a subway vent.

The Sun King's military models, saved from the Louvre.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

The first green space constructed on an elevated viaduct.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

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