Houska Castle, an eerie castle with a supernatural attraction, stands derelict in the dense forests near Doksy in the Czech Republic; experts investigate and uncover legends of a concealed gateway to hell and links to horrific Nazi Germany occult experimentation.

A legendary U.S. Naval war vessel, the USS Hornet (CVS-12), now stands as a monument to space exploration in Alameda, California; experts reveal how the formidable WWII aircraft carrier served a vital role in historic Apollo spaceflight recovery missions.