Get flying grades with our pergola installation even if you didn’t go to Friendship School (historical). A pergola is a fantastic way to dress up your backyard space in Callaway, MD. Our pergola installation is made as solidly as the foundation of Saint Mary’s County Detention Center. Want to learn everything you can about pergola installation, but don’t feel like checking out a book at the Saint Mary’s County Library - Leonardtown Branch? Well, you’ve come to the right place.