An 18th-century Spanish watchtower made entirely of seashell and concrete.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

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

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.