Once a year, at exactly 11:11 a.m., this monument comes to life.

An urban laboratory.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

A replica of the flagpole that gave a frontier town its name.

The cinder cone volcano with a less than complimentary name.

A mysterious spirit totem at the edge of Navajo lands.

This 1930s log cabin began as a taxidermy museum but is now a popular country music venue.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

At this local mall, visitors are ushered through a 1940s jail exhibit.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

A geological mystery on Camelback Mountain.

Although it also features red, orange, and variegated cliffs of Navajo Sandstone, this state park is often overshadowed by its more famous neighbor.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A sculpture of a flying hawk made from colorful car doors.

The fictional star of "Breaking Bad" is memorialized with a real-life gravestone in his hometown.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

Apparently, the whole cosmos emanates from this plain concrete tower.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.