Called in 1910 King Carol I Mosque was built by Romanian State for the necessities of Mostem supporters; the design belongs to the great inventor engineer Gogu Constantinescu and architect Victor Stefanescu made the building.

The building joins the Byzantine style (the tower and the imposing cupola) and Romanian architectural elements (the building itself), a unique mosque in Dobrogea. It is the first construction made in steel-concrete and brick in Romania; in time, steel-concrete rusted and the reinforcement of the tower and cupola was necessary, a difficult work made in 1957-1959 by professor Aurel Beles's design. The tower is 47 meters high and the sizes of preaching room are 14 meters per 14 meters the balcony is reserved for Mostem women 14 meters long an 3 meters wide. The altar is made in Moorish style, characteristic to worship Mostem buildings. Upon the main gate there are two Arabian inscription. In the yard on the left and on the right sides of the entrance there are wash-stands used for "abdest" as required by religion. Inside, on the floor there is a carpet brought from Ada-Kaleh island in 1965 as Sultan Abdul Hamid's(1876-1909) donation; the carpet was made in Hereche Handicraft Center, Turkey (it weighs 460 kg and the sizes are 9 meters per 16 meters). In the entrance hall there is a door-way that leads to the tower, where there is a winding staircase; the boy in charge to announce prayer time "climbs' 140 steps; on the tower top is a half-moon - the Moslem symbol.

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