Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

An 18th-century townhouse that once hosted guests of the president.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

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

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

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

The site of the climactic scene from the classic horror film is now a historic landmark.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Garments from across the globe call this hidden gem home.

The hippo that stands on this university campus was once a drunken flea market purchase.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

Obscure Freemasons still live in D.C.’s largest private residence.

One of the last mosaic tile facades found in the city.

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

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.