Where did Michelangelo make his art?

Question

In what catholic cathedral dome did michelangelo create his masterpiece?
Where is this cathedral located?
Who gurds this 'city'?
What is the name of the current leader of this city?

Answer 1

I'm assuming that these questions are referring to Michelangelo's work on the Sistine Chapel in the Vatican City, which is located in Rome, Italy. Michelangelo did paint the ceiling of the Sistine Chapel, but he also did design the dome for St. Peter's Basilica in the Vatican.