The Castro District, commonly referred to as the Castro, is a neighborhood in Eureka Valley in San Francisco. The Castro was one of the first gay neighborhoods in the United States. Having transformed from a working-class neighborhood through the 1960s and 1970s into one that came to represent some of the highest geographical and communal concentrations of same-sex coupling, the Castro remains one of the most prominent symbols of lesbian, gay and bisexual activism and events in the world.