This old abandoned sign flickers to announce a motel that isn't even there.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The largest wooden building in the world now houses a fascinating collection of aircraft.

A massive sea stack famous for its appearance in The Goonies.

The magic's in the hole!

The seamy, underground secrets of Portland's criminal past.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A colorful square marks the heart of the city's LGBTQ community.

Ruins of a Carnegie family mansion on Cumberland Island.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The "lovely red Vega" of the legendary record-settling pilot.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

It was once the base for a series of domestic terror attacks.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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