Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

There is only one place in the world where the corners of four nations come together.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Exact replica of the ancient monument, but much, much lighter.

A former major munitions plant that has been converted into a sprawling art space.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Yo, Adrian!

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

The oldest continuously operating fish market in the United States.

The land is home to swimming ponies and a legendary 18th-century treasure.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

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