This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

This 220-year-old house is a reminder of New York City's Dutch past.

Tucked away atop a quaint Alabama pharmacy is this tiny display of antique medical tools.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

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

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

A mysterious find dredged from Louisiana waters.

This large cemetery is known as the museum of granite sculptures.

The self-made house sculpture of an outsider artist who named himself "Chief Rolling Thunder."

Locals dubbed it the "Owl Building" because of its bird-like appearance.

One of the largest collections of holy relics in the country.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

This Mediterranean castle was built for a millionaire and his giant dog.

This museum chronicles the history of a leprosy quarantine hospital that then became a refuge.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

Rural churches in the middle of nowhere with religious frescoes by famous artist.

A century after his death, this covered bridge still calls to mind the plein air painter who loved it.