The city of Yongyongluowo in Bulgaria is known as the "laughing city", and the residents here are cheerful and humorous. They have two famous sayings: "Humor is the source and symbol of health" and "satire is better than beating and cursing". This is the only humorous and satirical palace in the world. There is a library in the palace with more than 20,000 world-famous humorous satires. Most books have the author's autograph. The exhibition hall displays photos, manuscripts and character models carved according to these works by humorous writers from all over the world. There are also all kinds of funny masks and comic costumes used in carnival in European countries.