This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

If they push on just the right spot, even the weakest person can move this titanic boulder.

Home to items never before seen by the public.

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

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

This free, take-a-book shop seems like a trick but isn't.

Bizarre Cavern.

The trials and tribulations of marking Poe's grave.

A museum dedicated to exhibiting remarkable outsider art.

Walk through the history of American pop culture.

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

The United States Capitol's former columns still stand.