When flour explodes, it's not a pretty sight.

A spiritual vortex among the red rocks in Sedona.

This sanguine boulevard was named after a deadly cowboy bar fight.

See massive fossils that are over 200 million years old in northeastern Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Open day and night, a church with three pews and Bibles.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

The world's longest known cave system.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

One of few surviving standpipe water towers in the U.S.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A unique geological area spiked with wind-carved rocks that resemble teepees.

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

A museum dedicated to the alleged Roswell Incident.