This abandoned church languishing for decades is now one man's passion project and subject of paranormal investigators.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The first KFC is on the National Register of Historic Places.

A Buddhist monastery tucked away in the mountains of Colorado.

A small oasis not far from downtown Moab.

Oddly shaped rock formation, misassociated with a nearby utopian community.

A whimsical roadside community of little metal people.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

FDR's Art Deco hospital tower was hopelessly inefficient.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

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

The oldest continuously operating fish market in the United States.

The site of the climactic scene from the classic horror film is now a historic landmark.

The national park was once a plantation estate.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Washington's iconic carousel has a nice piece of Civil Rights history.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.