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

The record holder for the world’s largest peach.

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

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

Every drop of D.C. tap water flows through this old waterworks.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

A line of blue paint marks the route of the inaugural parade.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.