The Dendera Temple Complex covers an area of 40,000 square meters ( sq. ft.), and is surrounded by a large mudbrick wall. Within this enclosure are various structures, including the Temple of the Birth of Isis, a Roman mammisi (attributed either to the reign of Trajan or Nero), a sanatorium, and a sacred lake. It was made famous by a carving that many believe depicts an electrical lightbulb. Nevertheless, the most impressive part of the temple complex is undoubtedly the Temple of Hathor.