Bicycle Day is an international holiday that commemorates the date that Dr. Albert Hofmann first tripped on LSD (Lysergic Acid Diethylamide-25) and bicycled home from his lab in Basel, Switzerland on April 19th, 1943. During the bicycle ride home, he experienced the psychedelic effects of LSD, making this the date of the first acid trip in history, propelling the West into the Psychedelic Age. Learn more…