Cities large and small are celebrating Gay Pride this weekend.

Two of the nation's oldest and largest festivals were being held Sunday in San Francisco and New York. Organizers behind Chicago's parade expect attendance to topple 1 million.

New York's celebration marks the 45th anniversary of the Stonewall Inn riots, which are credited with launching the modern gay right movement. (A live feed from the annual NYC Price March is embedded on this page.)

Organizers in San Francisco are hosting the city's 44th annual celebration.

Events are also taking place this weekend in France, Spain, Mexico, Bolivia and Peru.

In the U.S., revelers are celebrating the one year anniversary of two Supreme Court decisions which opened the door for gay weddings to resume in California and led to the federal government's recognition of the legal marriages of gay and lesbian couples.

In the year that followed, 22 state and federal courts have sided with gay couples challenging state marriage laws and constitutional amendments which limit marriage to heterosexual couples, many citing the high court's rulings.