The inspiration for the name and design stemmed from Aline Barnsdall's favorite flower, the Hollyhock. You can see references to the flower everywhere.
Tom of Finland (aka Touko Laaksonen) made some of the most iconic gay images ever and is probably one of the more broadly under appreciated and unknown illustrators of the twentieth century.
Rio's museum dedicated to science and sustainable living designed by Santiago Calatrava is impressive. The building was built to be energy efficient with features like solar spines.