A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

Two dozen pinball games hidden away inside a most unlikely location.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

These abandoned waterworks are crumbling into the Potomac River.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

100 years later, they're still down there.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

An Industrial Revolution-era public work that purified water using nothing but sand.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

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

A derelict bit of transportation infrastructure hidden in the woods.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.