The Constitutional
- http://www.theconstitutional.com/
- A self-guided walking journey through historic Philadelphia. The 3 mile journey includes sites such as the Liberty Bell, Independence Hall and The Betsy Ross House.
The Philadelphia Zoo
- http://www.philadelphiazoo.org/
- America's first zoo. Features a complete list of its over 1,800 animals with photos, descriptions, videos and webcams, and information on sponsorship.