No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Two massive rock outcroppings on the Oregon coastline.

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

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

Inside this curiosity shop, visitors can peruse the clown collection or purchase a molar from the mouth of Bigfoot.

The trials and tribulations of marking Poe's grave.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A painfully obvious spy house sits right across the street from the Russian Embassy.

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

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

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

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

Home to items never before seen by the public.

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

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

This taxidermy horse was a Civil War hero.

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

The 28,000-year-old specimen is remarkably intact.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Tacoma’s 25-foot coffee pot music spot has served up over 80 years of concrete kitsch.