Tickets for the memorial to 9/11 victims will be available for free online through a timed reservations system.

Memorial CEO Joe Daniels said Thursday that the online ticketing system will be activated sometime in July.

The memorial will open to victims’ families on Sept. 11.

Once it’s open to the public, starting Sept. 12, priority will be given to visiting family members.

The memorial will be the first thing that opens on the 16-acre World Trade Center site.

It will be surrounded on all sides by construction activity.

Daniels said memorial visitors will be instructed to report to a location south of the site. From there, they will be escorted to a security screening center.