Mt. Rushmore
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)
5 1 to hold the bulb and 4 to spin the ladder.
Mt. Rushmore! Happy presidents day!
Mount Rushmore
Mount Rushmore. Or Nickelback. I'm so sorry.