Top 10 smallest countries in the world. The world’s tiniest sovereign state, both in terms of size (44 hectares) and population (around 1000), demonstrates that little does not equal boring or uninfluential. It also has a significant cultural impact. The St. Peter’s Basilica is a baroque masterpiece, the Sistine Chapel is a Michelangelo masterpiece, and the Vatican Museums house the world’s largest art collection. If you want to do something completely different, schedule a tour of the Vatican Gardens.