The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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

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

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Home to a vast and influential collection of Shakespeareana.

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

The United States Capitol's former columns still stand.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

Museum houses an impressive display of the origin and artistry from the now-quaint invention's history.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.