Cemetery featuring rare glass-fronted columbarium.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

The deserted railroad town had a last gasp as a ghost town attraction before being abandoned for good.

A crumbling hospital from the 1850s on Roosevelt Island.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

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

The national park was once a plantation estate.

People escaping slavery may have hidden inside a corpse vault.

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

A derelict bit of transportation infrastructure hidden in the woods.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

This homegrown adoption center offers a wonderland of feline companionship.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

Hidden in magnificent rolling countryside, see what may be the largest modern stone circle in the world at Wisconsin's very own "Stonehenge”

A bizarre house filled with an astounding array of collections.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

The arboretum whose marshy soil sucked up the dreams of housing developers.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A wonderfully curated used bookstore in an airport.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.