A signal indicates the entrance to this alley, rumored to be a meeting place for witches.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

An exquisite tunnel of cascading flowers.