A fine, large-aperture telescope available for public use.

Nuclear reactor created the plutonium used on Nagasaki.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

A massive maritime collision may have led to the myth of a resort island's strange financial status.

Send a postcard while vacationing with Satan.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

There is one corporation registered for every three square feet of space in this inconspicuous office building.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

The massive machine creates cracking displays of indoor lightning.

The world's largest piece of copyrighted artwork.

To find the "unicorns of the deep" you've got to go downstairs.

Home of Howard Hughes' Spruce Goose.

The wooden airship was the largest flying boat ever built.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

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

Before he was America’s most famous preservationist, John Muir was an ingenious mechanical inventor.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

The longest continuous lava tube in Oregon.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A celebrity from the late Cretaceous period.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.