A small cistern is located under the former American missionary building called the Bible House. It measures 7.8 x 7.2 meters with a height of 3.19 meters. It has four columns (2 rows of 2 columns). It is noteworthy for its capitals, each of which is different: undecorated impost, Ionic impost with cross with acanthus leaves, impost capital with leaf and tongue motif, and impost capital with leaved cross, acanthus, and tongue motifs. While it still exists, it is not accessible to the public.