Jack Parsons was a rocket scientist who was part of occultist Aleister Crowley’s Thelema religion. And Devil’s Gate, a rock formation in Pasadena believed by some to be a portal to Hell, was allegedly the location of a ritual he performed to summon a demon. This is one of many examples of how Mark Frost cleverly weaves the show’s mythology into obscure real-world history in The Secret History of Twin Peaks.
Dougie Milford was investigating Parsons, and visited the rock. He was overcome with an “animalistic fear” of the same kind he felt when visiting Glastonbury Grove in Twin Peaks, which we know is an entrance to the Black Lodge. Parsons “danced too close to the flames” and “summoned a fire demon”, which sounds a lot like BOB. And the fact that his ritualcontains the line “The magician longs to see” is a direct link to the Fire Walk With Me poem heard several times in Twin Peaks.
This seems to confirm that Glastonbury Grove, the strange formation of sycamore trees around a pool of black oil in the woods around Twin Peaks, is not the only entrance to the Black Lodge. There may be others.