The Doors' most prolific touring year in support of Strange Days and Waiting for the Sun. Highlights included the legendary Hollywood Bowl concert on July 5 — later released as a live album — and the band's first European tour in September 1968. The European dates took them to London's Roundhouse (with Jefferson Airplane), Frankfurt, Amsterdam, Copenhagen, and Stockholm. Morrison's behavior grew increasingly unpredictable, including a drug binge in Amsterdam that hospitalized him briefly.