A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A crumbling hospital from the 1850s on Roosevelt Island.

The "first cat," "first dog," and even a presidential pygmy hippo all get their due in this museum.

The rogue roots are gradually consuming some of the historic marble grave markers.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

America's first public mental health facility.

An original apothecary from 1792.

The skeletal white beams stand as a monument to religious dissent.

Outsider art meets paleontology at this roadside reptile repository.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

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

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A priceless collection of the Nation's cryptologic history.