The great green copper dome of the Palace of Horticulture rises behind an extravagant Beaux-Arts entry pavilion dripping with gilded sculptural ornament, a towering palm framing the right edge of this luminous souvenir card from the 1915 Panama-Pacific International Exposition in San Francisco — one of the most celebrated world's fairs in American history, held to celebrate the opening of the Panama Canal and the city's own resurrection from the 1906 earthquake. The Palace of Horticulture, designed by Bakewell & Brown and costing $341,000, boasted a dome 152 feet in diameter — larger than the Pantheon's 142-foot dome — and was considered among the finest exhibition structures ever erected; the back of this card says so in emphatic print. Published by the Souvenir Guide Publishers from the Hobart Building in San Francisco, this unused card is a crisp, unposted survivor of one of the Gilded Age's grandest spectacles.