This isn't your average roadway—it's actually a National Park and a transportation pioneer.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

At 207 feet, one of the world's longest continuous escalators.

One street divides a single town that stands in two U.S. states.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Constructed by the younger brother of George Washington.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Where pardoned turkeys once spent their all-too-brief final days.

This former train station was once an important shipping depot for the regions farmers.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

A man-made island in scenic San Francisco Bay.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Five candy-colored villages on the Italian Riviera.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Model Trains and Much More in Hamburg.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.