By JAY SCHADLER

Sunset Boulevard may be the most dangerous place for dreamers in America. For a century, the wildly gifted and tragically desperate have come here to rock-n-roll the dice, believing stardom is just around the next corner.   On April 21,  "20/20? is going to take you for a ride down this 22-mile-long icon and introduce you to a new cast of dreamers - a streetwise runaway, a hard-partying gossip columnist, a starry-eyed rock band, a war veteran turned actor and the talented kids at Hollywood High trying to find their voice.

Few of the these true-life tales have Hollywood endings, but their stories will stay with you. What's your dream?  Tell us by tweeting #SunsetBlvd and watch "20/20: Sunset Boulevard" Saturday, April 21 at 9 p.m. ET.

Sunset Boulevard (Neil Emmerson/Getty Images)