This Sunday marks the tenth anniversary of the attacks on the World Trade Center, Pentagon, and United Flight 93. Here are a few ways that you can observe this solemn day.

New York

National September 11 Memorial & Museum

These man-made waterfalls and bronze inscriptions at Ground Zero will be officially dedicated on Sept. 11, 2011, in a ceremony for victims’ families. The 9/11 Memorial will be open to the public starting Sept. 12, but passes will be required to accommodate visitors during ongoing construction. Passes can be reserved here.

Tribute In Light

These two massive columns of light that stand in place of the fallen towers have appeared every year since the attacks. Reportedly, this will be the final year that the Tribute In Light marks the anniversary.

Washington D.C.

A Call To Compassion

Presented by the National Cathedral, these events will actually be spread out all over the city. The events will culminate on Sunday night in A Concert For Hope at the Kennedy Center for Performing Arts. The evening will feature a speech from President Obama, and performances from Alan Jackson, Patti LaBelle, and opera singer Denyce Graves. It will be broadcast live at calltocompassion.com and on some ABC affiliates.

Everywhere

National Day of Service

Pay your respects by giving back to the community on Sept. 11 (and everyday). The September 11th Day of Service and Remembrance can help you find volunteer opportunities in your area.

Post A Tribute Online

Visit 911day.org—it offers many ways to share your message: Upload a video or tweet telling how you will pay tribute. Facebook has also unveiled a function allowing users to dedicate their status to one of victims of the attacks.

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