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

Washington's iconic carousel has a nice piece of Civil Rights history.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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

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

The world's oldest soul food restaurant is also one of its best.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

The most accurate timepiece in the world.

Perhaps the most scandalous statue of America's first president.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Home to a vast and influential collection of Shakespeareana.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

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

The national park was once a plantation estate.

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

The oldest continuously operating fish market in the United States.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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.

People escaping slavery may have hidden inside a corpse vault.

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

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

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.