More than one million people have visited the Sept. 11 memorial in New York City since it opened four months ago.

The Ground Zero site in lower Manhattan, which contains the memorial plaza and its two huge fountains, continues to draw about 10,000 visitors each day.

Visitors are required to get a free pass in advance. For security reasons, no more than 1,500 guests are allowed in at one time.

The memorial opened on Sept. 12 this year, after its dedication on the tenth anniversary of the 9/11 attacks.

Officials say passes to visit the site have been reserved by people from all 50 states and from more than 120 countries.

Meanwhile, construction continues on the rebuilt World Trade Center.