The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This unique creation was made by the largest manufacturer of Christmas bulbs in 1946 to honor those returning from World War II.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

An outlandish shoe shaped house built by an eccentric millionaire.

Tens of thousands of tiny birds swarm into one school chimney every fall.