Vatican City, a city-state surrounded by Rome, Italy, is the headquarters of the Roman Catholic Church. It's home to the Pope and a trove of iconic art and architecture. It is so small that you can visit it in a day.
Vicenza - Characterized by a false perspective stage scenery, the Teatro Olimpico is the absolute climax of the creativity of one of the greatest Italian architects, Andrea Palladio. It's an UNESCO World Heritage Site.