This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This map, on display in the Library of Congress, and one of only seven known to exist, is the very first map of the United States.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

"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!”

The tunnel under the Capitol Building where Congress takes out its trash.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Home to items never before seen by the public.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

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

This taxidermy horse was a Civil War hero.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

The national park was once a plantation estate.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

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

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Former villa and estate of James Deering developed to preserve native tropical forests.

Remember and reflect at this 9/11 memorial site.