The United States Capitol's former columns still stand.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

An abandoned observatory in the middle of the Illinois prairie.

The cruel trial of a 13-year-old boy inspired the creation of this now abandoned reformatory.

This abandoned cemetery has a dark past of bodies buried over bodies.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

This overgrown Illinois water park offers a whole new type of adventure.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This airfield is home to a number of retired vintage planes in various states of disrepair.

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

A century-old network of freight tunnels underneath the city's historic business district.

This abandoned school has had many lives since the early 1900s, and all of them doomed.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

These abandoned grain silos and tunnels are an urban exploration dream.

Locals dubbed this abandoned abode the "gingerbread house" because of its odd architecture.

This isolated airport in the middle of the Everglades sees more alligators than planes.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

Jacksonville's highways rendered this century-old grammar school unusable.

This abandoned bridge is now a favorite haunt for graffiti artists.

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

This Florida arena, once host to "the fastest game in the world," has sat empty for 25 years.