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

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

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

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

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

A historic ruin just 20 feet away from a busy highway onramp.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

The god of wine stares out at passersby on this busy Pittsburgh thoroughfare.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

This shrine dedicated to the Virgin Mary is also a tribute from a mother to her fallen son.

These disused steel furnaces are now haunting ruins that may one day be a national park.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

This icon of the Atomic Age now lays dormant.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.