The Pyramid of Cestius is an ancient pyramid located in Rome, Italy. Built around 18-12 BC, it serves as the tomb of the Roman magistrate Gaius Cestius. The structure is approximately 27 meters tall and 22 meters wide at its base, showcasing a unique blend of Egyptian and Roman architectural styles. Constructed from concrete and covered with white marble, the pyramid is part of the Aurelian Walls that encircle the city. It is one of the best-preserved ancient monuments in Rome and reflects the influence of Egyptian culture on Roman society during the time of Augustus.