A humble plaque marks the site where the country music legend was found dead in his Cadillac.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

A small and quirky museum hidden inside a fence.

This abandoned sea fort has become an accidental bird sanctuary.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Home to items never before seen by the public.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

An astounding collection of medical specimens, including bits of President Lincoln.

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

The whole world in one water tank.