Martha Day Zschock, author-illustrator of the Helloboard book series, says Helloto Philadelphia, America's cradle of liberty and second most popular history destination. Join a parent and child eagle as they take a short tour of great sites in the City of Brotherly Love, and learn a little history too. See Ben Franklin, play in Fairmount Park, and eat a cheesesteak. Admire the murals, visit museums, and cheer on the sports teams. Best of all, find out about the founding of our country and the U.S. Constitution, the American flag, and the Liberty BellFor ages 2-5.