The bears may be gone, but their old cages can still be found.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

The 606 is a decade in the making.

This shop for all your super spy needs hides an educational secret.

This multi-story wooden waterpark offers homemade thrills.

Asheville, North Carolina, was the the second place in the world to enjoy Kentucky Fried Chicken's secret recipe.

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

A giant cat slowly prowls the parking lot of Zebulon's car dealerships.

This sinkhole is disguised as a pond and named after the man who stumbled upon it.

Art Deco urban decay at this historical building.

The first statue of Christ sleeping on a bench in the United States confused its affluent parish.

These eerie outliers of the lightning bug family glow a mysterious blue color.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

The birthplace of Appalachia's only first lady, who some have dubbed the United States' "first female president."

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

An original apothecary from 1792.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.