The Agua Caliente Casino and Resort opened in June 1928 in the Mexican city of Tijuana, Baja California. It was a lavish resort that included a casino, spa, championship golf and tennis facilities, its own airstrip, and lots of entertainment. Stylistically, the resort was an amalgam of Mexican colonial, California mission, and neo-Islamic designs that ranged from mosaic minarets, to cozy guest bungalows, to steaming Turkish baths. It was designed by 19-year-old architect Wayne McAllister and built by Baron H. Long, Wirt G. Bowman and James N. Crofton. Some sources note the fourth partner was Abelardo L. Rodríguez, Military Commander and Governor of Baja California, and future Mexican President.  The $2.5 million Agua Caliente racetrack opened in December 1929.
Drinking, gambling and horse racing were illegal in the neighboring U.S. state of California, so many wealthy Americans and Hollywood celebrities flocked to Agua Caliente. The actress Rita Hayworth was discovered there while performing in a show. The films In Caliente and The Champ were filmed on location there. The highlight of the opulent casino was the Gold Room, where patrons could only bet using gold chips, with a rumored $500 minimum wager. Bugsy Siegel cited Agua Caliente as his inspiration for building the resort on what became the Las Vegas Strip.