A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

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

A secret greenspace hides atop a Capitol parking garage.

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

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

A tunnel with windows, so you don't miss out on the impressive views.

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

Dr Barnes' $25 billion private collection of art and arboretum.

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.

Where America's first doomsday cult awaited the end of the world.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

These engineering masterpieces are a dominant feature of the Belfast skyline.

A museum marks and documents the site of the Titanic's launch.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

One of Philadelphia's largest murals resides hidden under this bridge.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

An overlooked tribute to one of the most important peace deals in American history.