The longest covered bridge in Delaware.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

Unannounced visitors are now welcome at the site of the largest Prohibition-era bootlegging operation in the region.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

A historic coal mine that doubles as a museum and tourist attraction.

Hike deep into the woods to explore this Gilded Age masterpiece.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

Teddy Roosevelt’s famous “midnight ride to the presidency" started at this small lake high up in the Adirondacks.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

One of the few surviving "Wigwam"-themed motels.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

An abandoned theme park with a strange and tumultuous past.

This public space is speckled with the eerie remnants of a defunct amusement park.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

How Quincy, Florida became the richest town per capita due to one man's shrewd business acumen and taste for fizzy drinks.

Working compound meant to allow visitors to reclaim the values and traditions of the past.

A tribute to the furry local heroes who helped get residents through many tough times.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

Ancient church constructed with a special wood that preserves prints from the past.

Though it's unclear why it's there, the lifelike sculpture of the giant lizard is oddly charming.