The U.S. Fish Commission’s effort to mass produce carp.

An overlooked memorial honoring the local Washington residents who died in World War I.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

A small 12th-century temple surrounded by waters believed to have curative properties.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

The first modernist church in Europe.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A wonderfully curated used bookstore in an airport.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

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

An architectural oddity hides in plain sight on this iconic London bridge.

The only place for a truly presidential dram.

This unassuming building produced some of the world's most famous bells.

A former factory serves as a shrine to the industry that sustained Santorini for decades.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

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

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A historic arena where the Beatles played their first concert in the U.S.