The use of adventure as part of a healing process can be traced back in history to many cultures including Native American, Jewish, and Christian traditions. Tent therapy emerged in the early 1900s. This practice brought certain psychiatric patients out of hospital buildings and into tents on the hospital's lawn. Many patients showed improvement during this treatment that prompted a series of studies, which failed to present enough evidence to support efficacy. Literature on this therapy lasted approximately 20 years and then dropped off completely.