Pyramid of Cestius Rome
Roman Era pyramid in Rome, Italy, near the Porta San Paolo and the Protestant Cemetery. It was built as a tomb for Gaius Cestius, a member of the Epulones religious corporation. It stands at a fork between two ancient roads, the Via Ostiensis and another road that ran west to the Tiber along the approximate line of the modern Via Marmorata. Due to its incorporation into the city's fortifications, it is today one of the best-preserved ancient buildings in Rome. The Pyramid was incorporated into the Roman Wall at a later period.

The pyramid was built about 18–12 BC as a tomb for Gaius Cestius, a magistrate and member of one of the four great religious corporations in Rome, the Septemviri Epulonum. It is of brick-faced concrete covered with slabs of white marble standing on a travertine foundation. The pyramid measures 100 Roman feet (29.6 m) square at the base and stands 125 Roman feet (37 m) high.

In the interior is the burial chamber, a simple barrel-vaulted rectangular cavity measuring 5.95 metres long, 4.10 m wide and 4.80 m high. 

During the construction of the Aurelian Walls between 271 and 275, the pyramid was incorporated into the walls to form a triangular bastion. It was one of many structures in the city to be reused to form part of the new walls, probably to reduce the cost and enable the structure to be built more quickly. It still forms part of a well-preserved stretch of the walls, a short distance from the Porta San Paolo.

When opened in 1660, the chamber was found to be decorated with frescoes, which were recorded by Pietro Santo Bartoli. Only scant traces of these frescoes survive, and no trace of any other contents. The tomb had been sealed when it was built, with no exterior entrance, but had been plundered at some time thereafter, probably during antiquity. 
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