The main temple is a domed hall. The diameter of the high dome is quite large, and the under-dome space predominates in the structure's interior. The vertical orientation of the interior is emphasized by the pillars supporting the dome. Attached to the pillars are several faceted pilasters and half-columns which form, at the top, semi-circular and pointed arches bearing the supporting girth of the domes. High niches, semi-circular in the plan, framed with graceful arcatures on twin half-columns, which decorate the bottom of the altar apses, harmoniously fit in with the pillars.