Prague astronomical clock is a medieval astronomical clock, which is installed on the south wall of the old city hall of Prague Old City Square. The core part of the clock, completed in 1410, consists of three main parts - the astronomical dial, the twelve disciples and the calendar dial. At the hour between 9:00 and 21:00 a.m. each day, twelve statues of the disciples of Jesus appear in turn by the clock, six turning left and six turning right. The God of death on one side begins to ring the bell, and the chicken on the other side will flap its wings and crow. This dynamic time report is the key landscape of Prague travel in the minds of tourists. There are also statues of four people on both sides of the astronomical clock. When making clocks, people use them to represent four kinds of people. A statue is called "conceit" which shows the admiration of one's self in the mirror; a Jew with a gold bag, which shows the usurer of "greed"; a skeleton standing on the other side of the clock, beating the newspaper at every right hour; and finally "Turkish pagan" who wears a long turban. Every time before the whole time, the square was full of waiting tourists. We watched the two time calls at 4:00 p.m. and 5:00 p.m., which was very interesting. If you climb the Bell Tower, you can overlook the old city of Prague.