 On the U.S. side, the park used to be part of the Monument Mesa picnic area but is now wholly located on federal property under the Department of Homeland Security and is heavily monitored by U.S. Border Patrols 24 hours a day.To the south of this place is the Playas de Tijuana, Baja California.In 1848, the United States built a pyramidal statue on the beach in what is today Imperial Beach, California to mark the end of the Mexican-American War and the initial boundary point between Mexico and the United States.