Ọtụtụ akụkụ nke mgbidi mkpọmkpọ ebe dị ihe dị ka mita 15 (50 ft) ogologo na mita 4 (13 ft) dị elu, nke a na-ahụ anya ugbu a, na-abanye n'ime ụlọ nke ugbo dị n'akụkụ ya n'akụkụ ugwu. A na-ejikọta mkpọmkpọ ebe na ụlọ ugbo na-esote na ọkwa II ma a na-ahọpụta mkpọmkpọ ebe dị ka ihe ncheta a na-ahazi. Mgbe a na-egwu ala n'ebe ndịda nke mgbidi ahụ iji kpughee ntọala ashlar nke ụlọ elu polygonal abụọ. Ebe ahụ dị n'akụkụ ọwụwa anyanwụ nke Castle Street n'ime ogige nke onwe ya nke enweghị ọha na eze.
Afọ 1988