Places neonsewers Wants to Go

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

Outsider art meets paleontology at this roadside reptile repository.

A wondrous old library overlooking the nation's capital.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

A royal relic from the time that gambling was accidentally made legal in South Carolina.

Railroad came. People came. Railroad left. Town died.

Sculptor Vadim Bora's bronze felines pay playful homage to architectural features no longer extant along Asheville's Wall Street.

A nearly century-old amusement park is quietly decaying in a riverside forest in South Carolina.

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

Enormous lake at the bottom of a unique cave system.

An ornate abandoned schoolhouse hidden in the woods near a decaying mill town.

An eerie site of reverence for those who have completed an epic journey.

Wander the locker-lined, terrazzo-floored halls and sleep in a former classroom at this unique inn.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A ghost town that was wiped out by a flood in 1940.

The remains of the iconic train crash from the movie 'The Fugitive' can still be found rusting along the Great Smoky Railroad.

Hidden amid a collection of trails is the site of a tragic crash.