Perth is the capital of Australia's Western Australia and the fourth largest city in Australia. The whole of Perth is like a big park, people on the street seem to be on vacation, this is the impression that Perth gave me. The city of Perth is built along the Swan River, and the city is full of casual and stylish atmosphere. The best way to explore Perth is on foot + free bus. The Perth Free Bus is called "Cat" by the locals and is divided into four categories: blue cat, red cat, yellow cat and green cat, connecting the main attractions of the city.