After decades of neglect, a brutalist icon is getting new life as an eco-friendly hotel.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The walls of the iconic dome are hollow and have a secret stairway.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

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

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

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Home to items never before seen by the public.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

The flow from this waterfall sometimes comes out of springs below its rim.

This spectacular fault escarpment, a popular hang-glider launch point, extends some 30 miles long and towers about 2,500 feet over the valley floors to the west.

Oregon's only closed-basin hypersaline lake, an important stopover for migrating waterfowl, is in danger of drying up completely.

In eastern Oregon, two mineral hot springs sit along the Malheur River in a fairly desolate area where peace and quiet are abound.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Home to the deepest rift anywhere on Earth.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.