In 1967, murder and mayhem disrupted the tranquility along this quiet stretch of Old Route 66.

Ancient pueblos built into the base of a natural canyon wall.

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.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

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

A small canyon with petroglyphs and a seasonal waterfall, only a short hike from the remnants of old Route 66.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

The Grand Canyon’s original airport, which once welcomed pilots like Amelia Earhart and Charles Lindbergh, lies abandoned.

For those going through a life transition, a place to leave behind a piece of your former self.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

One of the American Southwest's most extensive collections of Navajo rock art.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

"I did this all while you were watching TV."

Huge masonic hall in Philadelphia with lavishly themed rooms.

This elaborate towering structure was once famed for its revolutionary height.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Step into a pastel time capsule where candy is truly dandy.

Alexander Hamilton’s creation caused quite a bit of controversy.