America's largest man-made forest was planted in an effort to bring back the past.

Roaming bison and a spectacular view at the highest point in Nebraska.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Cannon designed to fire an atomic warhead.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

Less a museum than a bizarre fantasy world created by artists and engineers.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

All that's left of the quintessential "cabin in the woods."

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

Abandoned concert venue legendary for its rock counterculture.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

An abandoned relic of the city's failed experiment with below ground transit.

Ship skeletons haunt Baltimore's waterways.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

A toxic ghost town sitting atop a massive coal fire.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.