Old Aker Church
Old Aker Church () is a medieval era church located in Oslo, Norway. An active parish, the church is the oldest existing building in Oslo. The church is surrounded by Old Aker Cemetery.
St. Margaret's Church, Oslo
The church was built in the 13th century and is now a ruin. The church is named after Margaret of Antioch. It was located in Maridalen, close to the northern end of lake Maridalsvannet. Architect and archaeologist Gerhard Fischer led the restoration in 1934. Today it is the best preserved medieval building in Oslo next to the Old Aker Church. 
"The Maridal Play" ("Maridalsspillet") is a trilogy consisting of "Church Builder", "Black Death" and "Church Silver". It was written by Carl Fredrik Engelstad. The historical outdoor play is performed with the remains of Margaret's Church in Maridalen serving as a back ground. These and several other plays have been performed on site almost annually since 1974.