the taipei 101 observatory is open every day from 9am to 10pm. the observatory is spread over 4 floors where visitors can enjoy the fantastic scenery and learn about the engineering marvel that is taipei 101, the tallest green building in the world. visitors can buy the tickets on the 5f taipei 101 mall, the general ticket costs nt$500 per each and the student ticket (with valid id) costs nt$450 per each, all children (under 115 cm) are free. after purchasing the tickets, visitors may take the guinness world record breaking high-speed elevator to the observatory on the 89th floor.