Nothing says “I love you’’ like shooting a virtual gun with your sweetie. The $42 million National Mob Museum opens its doors in downtown Las Vegas on Valentine’s Day. The historic Stewart Avenue building once served as a federal courthouse and one of 14 locations for the historic Kefauver hearings of the 1950s. It now houses multimedia interactive exhibits that re-create courtroom and gun-shooting experiences. Artifacts on display include the wall from Chicago’s St. Valentine’s Day Massacre in 1929 and the barber chair in which mobster Albert Anastasia was murdered in 1957. Rates: adults $18, ages 5-17 and 18-23 with student ID $12. Open daily. 702-229-2734, www.themobmuseum.org