Indents in the pavement are all that remain from a grisly death machine in Paris.

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

The celebrated eyesore created by starry-eyed sweethearts.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A surrealist timepiece by the artist of melting clocks.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

This spectacular track has run continuously since 1882.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

An eclectic collection of artifacts from the Wild West is preserved in a remote fictional pioneer town.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

When ecosystems collide in the arid Southwest.

See six states, pickled freaks, rocks, and antiques.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

The largest self-built castle in the U.S., six decades in the making.

This Rocky Mountain mansion was the luxurious home of the authoritarian leader of a company town.