The living room's original block fireplace. Hollyhock House is now on the tentative list of the first modern architecture nominations from the United States to the United Nation’s Educational, Scientific, and Cultural Organization (UNESCO) World Heritage List. “Frank Lloyd Wright’s Hollyhock House is a crown jewel of Los Angeles architecture," Mayor Garcetti says.  Photo 4 of 6 in A Frank Lloyd Wright Gem in Los Angeles Reopens to the Public