The legendary architect Daniel Burnham outside his observation shack (circa 1904) on Twin Peaks where he studied San Francisco's topography for his "city beautiful" plan. Parts of Burnham’s architectural vision and ideas also became the building blocks for Panama-Pacific International Exposition’s architecture.
“We have found that those cities which retain their dominion over the imaginations of mankind achieve that result through the harmony and beauty of their civil works,” Burnham wrote.