Stanhope, John Spencer: Olympia or topography illustrative of the actual state of the plain of Olympia and of the ruins of the city of Elis (London, 1824)

by 26 feet 6 inches in width, in one part, and 13 feet 2 inches in another;
in the widest part of this chamber, there is a circular recess. There are
also the remains of a square niche in the wall supporting the bank, and
which probably contained a statue. Every part of this building has been
enclosed with arches, and to all appearance it has been of considerable
extent, as fragments of walls are found for some distance; and on the Plain
above, we traced some considerable foundations. The walls are constructed
with brick on both sides, of a single thickness, the inside filled up with large
round pebbles, and grouted with mortar. The size of these bricks is 9*-
inchcs square by H inches thick, and with mortar 2i-inches in thickness; half
bricks, 9i inches by 5* and 1$ inches thick. The building marked by the letter
J3 presents an area of 16 feet 5 inches square within the walls; it appears to
have been part of a larger edifice; it has been domed, and all its openings
arched. It is situated immediately iri the entrance of the valley of Antiialo.

The ruin marked by the letter C offers little more than the remains
of two longitudinal walls, which have been enclosed with an arch: it
is remarkable, that all these ruins have small square apertures, pierced
obliquely through the walls; they appear to have been introduced for the
purpose of ventilation.

The last ruin represented in this plate shows the remains of a wall of
a similar construction to the others. It is situated towards the eastern
vicinity of the Plain, on the banks of the rivulet running through the valley
of Miraka.