In 1926, Pope helped design the Persian pavilion and organized an exhibition of Persian art for the Sesquicentennial Exposition in Philadelphia. That year he also organized the first international congress on Persian art; he would lead four more of these congresses over the next 40 years. By 1927, he and Phyllis returned to San Francisco and pursued additional design projects, including an ornate Persian-palace-style interior for the penthouse of the Fairmont Hotel in San Francisco and the interior of the Ahwahnee Hotel in Yosemite National Park, where they made extensive use of Middle Eastern kilims as well as Native American artifacts.