A layered tribute to the work of mosaicist Isaiah Zagar.

These crumbling towers are some of the last remnants of a centuries-old Vietnamese culture.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

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

A clone of a cloned tree that was so important it allegedly had its own guards.

The span is crooked and made from two older recycled bridges.

This lovely pocket park is one of the most under appreciated in D.C.

Home to a vast and influential collection of Shakespeareana.

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

This grand gothic brewery has been pumping out suds for over a hundred years.

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

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

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

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

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.