St. Hanshaugen
To the southeast of the park is Oslo’s oldest building – Aker Kirke, built around 1100, but restored from ruins around 1860, and then again in the 1950s in a more authentic style. Next to the church is the cemetery Vår Frelsers gravlund, created in 1808 as a result of the great famine and cholera epidemic of the Napoleonic Wars. The nearby area around Damstredet and Telthusbakken is interesting since it retains the small town character of Oslo in the first part of the 19th century.
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.