Some of the images were made available by these kind people:

Photo by jfl1066

Photo by zhouxuan12345678

Photo by cheeseslave

Photo by mislav-m

Photo by Horia Varlan

Photo by Horia Varlan

Photo by Hebe Aguilera

Photo by Rum Bucolic Ape

Photo by frankjuarez

Photo by Chris Winters

Photo by foilman

Photo by Arlington County

Photo by tec_estromberg

Photo by shawncampbell

Photo by Pink Sherbet Photography

Photo by GIOCONDA Centru de Frumusete

Photo by GIOCONDA Centru de Frumusete

Photo by GIOCONDA Centru de Frumusete

Photo by Life Mental Health