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Campus Calendar Cafe menu Breathwork Donation based wellness The Mission of the Joshua Tree Retreat Center also known as The Institute of MentalPhysics is to demonstrate an inclusive and equitable model by Offering an intentional habitat centered around deep inquiry into spiritual practice Enhancing the spiritual science of Mentalphysics Providing unique educational opportunities in organic architecture and regional culture Origins Organic Architecture Gathering Spaces Stewardship Joshua Tree Retreat Center is the physical manifestation of the deserts spirituality. J. Cheryl Bookout JTRC Board Member Contact Support Us by Paypal With Support From The Joshua Tree Retreat Center home of the Institute of Mentalphysics is the oldest and largest retreat center in the Western United States and was listed on the National Register of Historic Places by the United States Department of the Interior on January 17 2023. As a nonprofit 501c3 our mission is to be a retreat center for individuals and groups to create and experience new ways to approach spiritual living and personal wellbeing.