Grand Canyon National Park General Regulations.

Model of Hexahedron Arcology city structure design by Paolo Soleri, from 1970 exhibition at Corcoran Gallery of Art, Washington, DC

Plastic model of Hexahedron Arcology design by Paolo Soleri

Model of Hexahedron Arcology design by Paolo Soleri

Photograph showing people at Ceramic Apse under construction at Arcosanti

Photograph showing people at vaults under construction at Arcosanti

Photograph showing vaults under construction at Arcosanti

Photograph of vaults under construction at Arcosanti

Photograph showing Paolo Soleri working on construction (1960s) of Foundry Apse at Cosanti in Paradise Valley, Arizona

Photograph of bronze bell windchimes hanging from South Apse at Cosanti in Paradise Valley, Arizona