In a state known for liberal politics, perhaps the most iconic statement is the 252-foot billboard by Lansdowne Street overlooking the Mass. Pike.

For the past 13 years, activist John Rosenthal has decorated the edifice with a series of direct, bold advertisements for gun control.

The newest billboard (left), which was unveiled today, features a satirical gun show advertisement. Scroll through this gallery to see other ads that have emblazoned the billboard through the years.