A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A toxic ghost town sitting atop a massive coal fire.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

Concrete strongholds stand guard over the Golden Gate.

The site of Paul Revere's historic two lantern warning.

Memorial to the father of the Republic of China.

World War II bunker still standing on the New Jersey beach.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A man-made island in scenic San Francisco Bay.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Steepest flood safety railway in the entire world.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

An abandoned stretch of highway, deteriorating next to the operational one.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Gutted airplanes slowly decay in a Florida field.