Michelangelo, Sistine Chapel, Vatican this shows both the ceiling and the last judgment. The ceiling is a beautiful work of art with great detail. The last judgement even has more detail and it was done 29 years after the ceiling.
Trevi Fountain in Rome, Italy -- "the fountain at the junction of three roads." Throw a coin into the fountain, and legend has it that you will return to Rome. I wish I'd tossed a coin in while I was there!