History of Union Square, San Francisco

Union Square and St. Francis Hotel after Earthquake, San Francisco, News Photo - Getty Images

A HISTORY OF UNION SQUARE - FoundSF

Union Square San Francisco: Top Activities & Hotels

CALIFORNIA: San Francisco; Union Square, antique print 1907 Stock Photo - Alamy

History of Union Square - Books & Stories

San Francisco denies permits for SantaCon - Curbed SF

Map of San Francisco by Neighborhood (16 You Should See) - California Travel

A century of Union Square photos (with bonus mime action!)

Union Square, San Francisco, San Francisco - Book Tickets & Tours