In Search of... is an American television series that was broadcast weekly from 1977 to 1982, devoted to mysterious phenomena. It was created after the success of four one-hour documentaries produced by creator Alan Landsburg: In Search of Ancient Astronauts in 1973, In Search of Ancient Mysteries (1973) and In Search of Ancient Mysteries (1974), and The Outer Space Connection in 1975, all of which featured narration by Rod Serling, who was the initial choice to host the spin-off show. Serling died before production started, and Leonard Nimoy was then selected to be the host. The series was revived with host Mitch Pileggi in 2002 and again in 2018 with Zachary Quinto for the History channel.

The Lost Dutchman's Gold Mine is, according to legend, a rich gold mine hidden in the southwestern United States. The location is generally believed to be in the Superstition Mountains, near Apache Junction, east of Phoenix, Arizona. There have been many stories about how to find the mine, and each year people search for the mine. Some have died on the search.