Havariler( Disciples) Church (Kümbet Mosque, Center): It is the one on the southern slope of the Kars Castle in Kaleiçi District,the church has been well preserved till to our times. It was constructed between the years 932-937 by King Abbas of Bağrat who announced Kars as the capital city. In 1878, it was restored by the Russians. The belfry had been built adjacent to the church in 1890 was demolished in 1918.

After long periods of service as a church, the building was converted into a mosque by Seljuks in 1064. Still it was used as church in the following years. Reconverted into a mosque in 1918, the building finally decided to be used as a museum in 1964.