Hours may change seasonally, so call ahead for information.
A couple of blocks away from the Liberty Bell is Declaration House (or Graff House), also part of the National Historic Park. In 1776 the Virginia delegate (Thomas Jeffeson) to the Second Continental Congress rented rooms in this building, and it was in these rooms that he wrote a little document called the Declaration of Independence. School-age kids will be especially interested to see the exact place where the Declaration of Independence was penned.
We enjoyed seeing a recreation of two of the rooms Thomas Jefferson rented & where he wrote the Constitution. We learned that upon waking each morning, Thomas would soak his feet in ice & water (brrr!). Downstairs is a small museum that was informative. The very best part for the kids was meeting Thomas Jefferson (someone in costume, of course). He spoke as you would expect Thomas to speak and he spoke as if he really were Thomas. The kids enjoyed asking him questions and getting their picture taken with him. How fun for them to learn history from Thomas Jefferson! He's only there certain days & times, so check before you go.