Beneath a sweeping green glass dome that dwarfed even St. Peter's in Rome, the Palace of Horticulture at the 1915 Panama-Pacific International Exposition was the crown jewel of San Francisco's triumphant comeback after the 1906 earthquake — and this hand-colored real-photo postcard captures it in all its Beaux-Arts glory, framed by a towering Canary Island date palm. The ornate gilded entrance pavilion, flanked by classical urns and figurative sculpture, glows warmly against a pastel California sky. The reverse notes the dome measured 152 feet in diameter — surpassing both St. Peter's (137 ft) and the Pantheon (142 ft) — and that architects Bakewell and Brown of San Francisco designed the building at a cost of $341,000. Published by Souvenir Guide Publishers from the Hobart Building, San Francisco, this card was sold on-site at the Exposition and is an essential artifact of the PPIE, one of the most celebrated world's fairs in American history.