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

This shop for all your super spy needs hides an educational secret.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

This quirky curiosity shop takes its cues from the world's bazaars.

All of Chicago's wood-paved streets are long gone but two alleys remain.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

A display of magnificent stained glass windows is the first exhibit of its kind.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The state's only comprehensive museum dedicated to the mineral that defined its history and economy.

An urban laboratory.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A self-built castle made by a mysterious man.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

The homestead of American patriot John Adams.

One artist's yard is full of shining, whirling kinetic sculptures that look like pure steel psychedelia.

An unusual bed & breakfast made of papercrete.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.