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.
The best thing FREE about Rome is exploring the city itself. There can be a surprise around every corner: a giant marble foot (maybe not a surprise when you realize are on Marble Foot Street), a beautiful fountain, a magnificent church, or an ancient arch