The site of one of history's most indelible and horrific tragedies.

A very big rock just plopped down in the New England woods.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Even Henry David Thoreau found this glacial pothole irresistible.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

A devilishly named gorge that was a sign of salvation for many pioneers.

The easiest way to the highest point in Wyoming is only accessible via one hefty fee.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

A popular rock that acted as a waymarker for American pioneers.

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.

An architect's childhood fantasy treehouse made real.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

Deep scars on the earth left by the Ice Age.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

A museum dedicated to the exploring past, present, and future innovations.