Tickets are now on sale for the observatory at the top of One World Trade Center, the tallest building in the country. 

The deck, which takes up several levels, will officially open to the public on May 29. The main viewing space is on the 100th floor, restaurants are on the 101st floor and an event space is on the 102nd. 

Visitors will get to take in a view of the city and its surroundings from above 1,250 feet. 

Admission is $32 for adults and $26 for children between 6 and 12 years old. However, it will be free for the family members of those who died on Sept. 11, as well as those who worked in the rescue and recovery.