Curtiss is a forgotten figure in the early history of flight.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

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

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

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

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

One man's homage to the sun continues to grow like a glass fractal.

Nationwide network of co-ownership underground catastrophe shelters.