The Psychadelic Shop
According to Jessica Willamy, The Psychadelic Shop, also known locally as The Head Shop, was "the symbolic head" of the Haight, providing information and materiel necessary to take whatever recreational drug one desired. It was a particular proponent of LSD.
Located directly underneath the offices of the San Francisco Oracle, at the exact corner of Haight and Ashbury Streets in San Francisco, it was clearly a central experience to the lives of local residents. Ron and Jay Thelin, who also bankrolled the Oracle, opened it in 1966.
The Second Doctor, Ben and Polly visited the shop in January 1967, at which time the Doctor was particularly interested in various bongs and pipes that were on offer. (PROSE: Wonderland)