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

The romance of early commercial flight still fills this Art Deco destination.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Right next to departures—how convenient!

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

D.C. once had its own tiny rival to the New York Stock Exchange.

A line of blue paint marks the route of the inaugural parade.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

This is the house that spite built.

Narrowest house in Boston.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

A museum dedicated to the history and exploration of both popular music and science fiction.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A flooded Mexican cave that hides a river beneath the water.