[6] In 2008, the National Park Service submitted ten Frank Lloyd Wright properties to a tentative World Heritage list.

[14] In March 2015, the United States Department of the Interior again nominated ten Wright–designed structures for inclusion on the World Heritage List.

[18][19] The Conservancy–led Frank Lloyd Wright World Heritage Council collaborated with the National Park Service and UNESCO to modify the nomination.

[20] Eight of Wright's buildings were re-nominated to the World Heritage List in December 2018;[21][22] the Price Tower in Bartlesville, Oklahoma, and the Marin County Civic Center in San Rafael, California, were excluded from the proposal.

[24] It was the 24th World Heritage listing in the United States to be designated,[1][2][25] and it was the first time that modern American architecture had been recognized by UNESCO.