The answer to this riddle was Hangzhou. Hangzhou is a city in China, located in the middle of Zhejiang Province. It is a famous historical and cultural city and one of the scenic tourist attractions in China. Hangzhou has a long history and culture, known as the "paradise on earth", famous for its beautiful natural scenery, long history and culture, rich cultural landscape and warm climate. In Hangzhou, you can enjoy all kinds of buildings, including ancient buildings, modern buildings and artistic buildings. In addition, Hangzhou has many parks, lakes and rivers. It is a city that is very suitable for living and tourism.