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A carpet at The Mob Museum which features various organized crime groups is pictured Monday, Feb. 13, 2012, in Las Vegas. Las Vegas has long been enamored with its gangster roots. (AP Photo/Isaac Brekken)

A carpet at The Mob Museum which features various organized crime groups is pictured Monday, Feb. 13, 2012, in Las Vegas. Las Vegas has long been enamored with its gangster roots. (AP Photo/Isaac Brekken)

Mob museum opens in Las Vegas

On the 83rd anniversary of the St. Valentine's Day Massacre, Sin City is honoring one of its earliest relationships with the grand opening of a museum dedicated to the mobsters that made this desert town.