The Association of Philadelphia Tour Guides (APT) was founded in 2008 to bring professional and volunteer guides together, to act as a voice for our membership, and to insure a high quality experience to every visitor to our city. APT, with a membership of about 120, is incorporated as a Pennsylvania non-profit organization. APT knows that tour guides take great pride in the services they provide those who wish to explore the rich historical, architectural and cultural resources of Philadelphia.