A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

A glittering Thai Buddhist temple in suburban Pennsylvania.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

The Home and murder site of the witch of Rehmeyers Hollow.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This abandoned Victorian-style house was built in 1884.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This forgotten boat elevator was an engineering marvel in its heyday.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A derelict bit of transportation infrastructure hidden in the woods.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A hidden alley in urban Baltimore is a haven for graffiti artists.

Giftshop catering to cryptozoologists and anyone with a sense of humor.