This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Home to a vast and influential collection of Shakespeareana.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

This poor little statue is the most vandalized memorial in Washington.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

There’s a hidden military meme engraved on the World War II Memorial.

Largest Roman Catholic church in North America.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Extraordinary objects lurk in this quintessential regional museum.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

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

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

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

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

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