Paul Walker -- Hundreds Pay Tribute ... On Death Anniversary

Paul Walker fans paid tribute to the deceased actor Sunday on the one year anniversary of his death ... by appearing in droves at the site of the crash.

Hundreds huddled around the crash zone to leave flowers and pay their respects ... but the rain put a damper on candle lighting.

There was a heavy police presence -- it's unclear why -- but it went down without incident.

Walker was the passenger in a Porsche last year when the driver of the car, Roger Rodas, lost control and crashed into a tree. The car instantly burst into flames with both men inside.