1. Large size: Roman domes were often much larger than those found in earlier civilizations. Some, like the Pantheon's dome in Rome, were over 140 feet in diameter.
2. Use of concrete: Romans were known for their use of concrete in construction, and this material was instrumental in creating the large, stable domes that they became famous for.
3. Ribbed designs: To reinforce their domes and make them even more durable, the Romans would often produce ribbed designs on the surfaces of the domes themselves.
4. Oculi: A unique feature of Roman domes is the presence of an oculus – a circular opening at the top of the dome, which allowed for natural light to enter the structure below.
5. Ornamentation: Roman domes were often decorated with intricate relief carvings, mosaic tilework, and frescoes, which added to the structures' overall beauty and grandeur.
6. Circular shape: Most Roman domes were circular in shape, although some were octagonal or polygonal.
7. Vaulted ceilings: The use of domes in Roman architecture often went hand-in-hand with the use of vaulted ceilings, which were also constructed with concrete and reinforced with ribbing.
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