FDR's Art Deco hospital tower was hopelessly inefficient.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

An astounding collection of medical specimens, including bits of President Lincoln.

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

A priceless collection of the Nation's cryptologic history.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The land is home to swimming ponies and a legendary 18th-century treasure.

This abandoned radar station from the Cold War era now only broadcasts a seriously ominous air of isolation.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A living antique aviation museum in the historic town of Red Hook, New York.

The Hudson River School comes alive at this palatial estate.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

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

This pun was simply waiting to come to life, and one defense contractor made it so.

Every drop of D.C. tap water flows through this old waterworks.

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

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.