The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

An urban forest overtakes what was the greatest failure of utopic urban housing.

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

A floating museum that was sunk by a flood and left to rot in the tides.

The man who was president for only one day and spent most of it asleep.

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

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

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

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

On the side of Arkansas' Great River Road stand the remains of a forgotten World War II POW Camp.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Home to Hollywood history and a very special salt crystal.

European castle ruins in an American state park are actually the product of death and grief.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

Crumbling hotel echoes with the sounds of the '30s.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

This downtown Dallas art installation is always on the lookout.

A modernist landscape of water and sci-fi concrete.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

A registered historic landmark shrouded in unsettling local legends.