The only buildings of any importance within the enceinte are two mosques, which are rapidly falling into ruin. The largest (No. 18) is placed just opposite the gateway of the citadel, and is of charming proportions and design. The entrance is approached through a spacious portico, which extends the whole length of the wall. The piers or columns, which must have supported the roof of this structure, in the form of a façade, are no longer in their place. But one still admires the vaulted and groined ceilings, the vaulting being done in brick. And through the openings in the side walls, with their ogee arches, pleasant prospects are obtained. The face of the main wall, against which the portico rests, is decorated in a simple and efficacious manner by means of an alternation of bands of white marble with bands made up with blocks of black and of pink lava. The main doorway, which gives access through this wall into the mosque, is surmounted by a pointed arch. A slab of white marble over the door is inscribed with a legend in Persian verse. It relates that the mosque was erected by Sikandar or Iskandar Pasha; a chronogram gives the date of A.H. 976 or A.D. 1568. On either side of the doorway, as well as above it, openings with ogee arches admit light into the interior. In front of, but contiguous with, the portico on its south-west side, a massive circular minaret rises into the sky. It is seen, like a landmark, from afar. It does not taper perceptibly; but the honeycomb cornice which supports the balcony is surmounted by a second tower of smaller diameter. The cupola has fallen from this uppermost shaft. A band of white limestone, and two bands of black lava encircle the even masonry of pink lava. A heart-shaped stone, high up, is engraved with Arabic characters, setting forth the name of the founder, Sikandar Pasha, and giving the date as A.H. 978 or A.D. 1570. The interior of the mosque is of extremely pleasing design--a circle described by eight pointed arches, springing from a square ground plan. Four of these form recesses at the angles of the square; the remainder rest against the walls. The members of the arches are built of stone; but the walls are lined and the vaultings constructed with narrow bricks. The dome rests on the points of the arches, encompassing the interior with its beautiful curves. From the outside it is octagonal in shape. In the south wall are three apertures which serve as windows; two are of fair size. The dimensions are a square of 42 feet 6 inches. The altar is built of white marble, and the masonry throughout the building is carefully faced and joined.