(AP) - The observatory at the top of One World Trade Center, the tallest building in the U.S., will soon be open to the public.

Tickets will go on sale starting April 8, and the observatory will officially open May 29.

The observatory takes up levels 100, 101, and 102 of the center. The main public viewing space is on the 100th floor, with restaurants on the 101st floor and an event space on the 102nd floor. Visitors will get a view of the city and its surroundings from above 1,250 feet.

Tickets will be $32 for adults and $26 for children, ages 6 to 12. Admission will be free for family members of those who died on Sept. 11, as well as those who worked in the rescue and recovery.