The most decorated dog of World War I is preserved in the Smithsonian.

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

A nostalgic bibliographic gem.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A wondrous old library overlooking the nation's capital.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A historic neighborhood church is reborn as a psychedelic arts collective.

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

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

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

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

Home to items never before seen by the public.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The United States Capitol's former columns still stand.

Despite producing just a handful of movies, a brave and lyrical filmmaker has an entire museum dedicated to him.

Spring that emits water and fire at the same time is said to have remedial properties, and sparked its own religion.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

A mechanized clock where a man fights off a dragon, crab, and rooster.

Notorious artist squat renovated into legal studios.

Burlesque Hospital Themed Restaurant.

Former prison camp dedicated to the victims of political repression.

An unused hyberbolic electricity pylon kept as architectural monument.

A Russian museum dedicated to the household staple, the samovar.

Unusual, mushroom-like rock formations caused by weathering and water erosion, set to disappear, according to geologists.