Petra is known primarily for its Hellenistic architecture.
The facades of the tombs in Petra are commonly rendered in Hellenistic style, reflecting the number of diverse cultures which the Nabataens traded, all of which were in turn influenced by Greek culture.
Most of these tombs contain small burials niches carved into the stone.
Perhaps the best example of the Hellenistic style is seen in the Treasury, which is 24 meters (79 ft) wide and 37 meters (121 ft) tall and references the architecture of Alexandria.