One of the main attractions in Lazarevac is the Church of St. Demetrius. It is basically a mausoleum, a main memorial built in the memory of Serbian and Austro-Hungarian army soldiers that were killed at the Battle of Kolubara. 40,000 killed soldiers, both Serbian and Austro-Hungarian, were buried in the memorial ossuary of the church's crypt. It is the largest World War I necropolis in Serbia. "The Committee to raise a memorial church and crypt in Lazarevac" was established in order the build the church. In the 1937 Committee was disbanded and "The Society for raising a memorial church with crypt in Lazarevac" was formed instead, led by a priest Borivoje Đorđević. Finally, the temple was built by the Russian émigré architect Ivan Afanasjevič Rik between 1938 and 1941. In the architectural and urban environment of Lazarevac, the temple stands as a significant achievement of interwar Serbian church architecture.