Officials at the Sept. 11 Memorial in New York City say they will announce Thursday that the site has had 1 million visitors since opening to the public this year.

The memorial plaza and its two huge fountains bring about 10,000 visitors each day to ground zero.

Visitors are required to get free passes in advance, and no more than 1,500 people are allowed on the site at a time.

The memorial opened Sept. 12, after its dedication on the 10th anniversary of the terrorist attacks.