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.

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

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

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

A tourist attraction founded around a slumping cabin.

A massive sea stack famous for its appearance in The Goonies.

Only known mainland rookery of the threatened Stellar sea lion.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A walk through the historic city center, under the streets of Seattle.

Home to the deepest rift anywhere on Earth.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

This steamer is known as "The ship that built Cleveland."

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The only presidential monument to display a late POTUS's actual casket.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

An abandoned asylum incorporated into a college campus.

Rare recess caves fill this unbelievably beautiful Ohio park.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.