The museum opened in 2000 to celebrate America's diversity and democracy by looking at more than 2,000 modern heroes of liberty, ranging from Dr. Martin Luther King, Jr., to the rescue workers who perished on September 11, 2001. While the Museum is in the heart of Philadelphia's historic district, the galleries take a thoroughly fresh, diverse view of America's promise. The exhibits also explore modern issues confronting their visitors: character education, including respect for diversity, the evolution of America's democracy, ways to defuse violence and immigration's role in the United States. Fun, interactive exhibits, such as the new "Heroes of Character" tempt children to learn "hands-on." Kids-only voting machines allow children to vote on current events, and a shredding machine lets them destroy the negative words that lead to violence. Stunning collections of glass art sculptures, life-sized "Jellybean People" sculptures illustrate the beauty of diversity.