On a bustling Denver street corner circa 1907, horse-drawn carriages jostle for position outside the grand Beaux-Arts Municipal Auditorium — its copper-domed turrets gleaming green against a luminous sky — while fashionably dressed Edwardians throng the sidewalk in a scene that pulses with the energy of a booming Rocky Mountain city. Built in 1908 and opened for the Democratic National Convention that nominated William Jennings Bryan, the Denver Auditorium (later Ellie Caulkins Opera House) stands here in its earliest days, the "I.A.D.L. AUDITORIUM" sign clearly legible across its classical portico. Published by the Great Western Post Card & Novelty Co. of Denver, this undivided-back card with its domestic one-cent / foreign two-cent stamp box places it squarely in the transitional 1907–1908 era of American deltiology.