These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Art deco landmark on the outskirts of Washington, D.C.

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

Daily lunch spot for many of Washington, D.C.'s cab drivers.

Largest Roman Catholic church in North America.

A haunting tribute to pioneering photographer Clover Adams.

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

Tiny observatory made big contributions to the study of the Earth's motion.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

The Home and murder site of the witch of Rehmeyers Hollow.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.