San Francisco, CA Photo - Union Square, San Francisco, California

Union Square is a plaza of 2.6 acres (11,000 m2) bordered by Geary, Powell, Post and Stockton Streets in San Francisco, California. "Union Square" also refers to the central shopping, hotel, and theater district that surrounds the plaza for several blocks. The area got its name because it was once used for rallies and support for the Union Army during the Civil War. Today, this one-block plaza and nearby area is one of the largest collections of department stores, upscale boutiques, tourist trinket shops, art galleries, and salons in the United States, which continue to make Union Square a major tourist draw, a vital, cosmopolitan place in downtown San Francisco, and one of the world's premier shopping districts. Grand hotels and small inns, as well as repertory, off-Broadway, and single-act theaters also contribute to the area's dynamic, 24-hour character.

Carol M. Highsmith (born 1946) is a photographer, author, and publisher who has photographed all 50 of the United States, the District of Columbia, and Puerto Rico for 30 years. She specializes in documenting architecture, ranging from the monumental to the everyday and whimsical. Highsmith is donating her life ’s work of more than 100,000 images, copyright-free, to the Library of Congress, which established a rare one-person archive. Out of 14 million images, the Carol M. Highsmith collection is featured in the top six alongside of Mathew Brady and Dorethea Lange. Credit line: Photographs in the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.

Credit line: The Jon B. Lovelace Collection of California Photographs in Carol M. Highsmith's America Project, Library of Congress, Prints and Photographs Division.