The Empty Sky is a memorial dedicated to 749 people from New Jersey who lost their lives in the 9/11 attacks.
The Irish Hunger Memorial is designed to raise awareness about the Great Irish Famine.
America's Response Monument is a life-and-a-half scale bronze statue in Liberty Park overlooking the National September 11 Memorial & Museum in New York City.
The Sphere is a large metallic sculpture by German sculptor Fritz Koenig, displayed in Battery Park, New York City.
The National September 11 Memorial & Museum is a tribute of remembrance and honor to the nearly 3,000 people killed in the terror attacks of September 11, 2001.