The largest source of fossilized insects anywhere.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Abandoned silver mine strewn with wrecked and twisted structures.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

When ecosystems collide in the arid Southwest.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

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

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

The first "applecore" style lighthouse in Nova Scotia.

This tiny patch of arid sand sits in one of the greenest states in the United States.

The world's largest rotating world.

An architect's childhood fantasy treehouse made real.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

A world-class observatory in the California desert.

The only structure left with direct ties to the Salem witchcraft trials of 1692.