oculo, or oculus i think
the dome over pantheon is made up of concrete
The Pantheon has a dome that is made of concrete. The dome of the Pantheon is and always has been the largest unreinforced concrete dome in the world.
pantheon
No. The Parthenon in Athens does not have a dome, but it may be confused with the Pantheon in Rome which does have a dome.
There were actually two Roman buildings that used a dome. One was Nero's Golden House and the other was/is the Pantheon.
pantheon
The architectural developments used in the pantheon were the use of the dome, (a perfect sphere) lighter concrete mixtures in the dome, and the use of coffers, or sunken panels in the dome to reduce the weight.
Its use of the cupola (dome) as a roof.
it holds the tension of the dome
You might be thinking of the Pantheon, however the Pantheon was more hemispherical and would not have worked on the scale of Brunelleschi's dome so he had to use newer Gothic methods.
The ceiling of the Pantheon was dimpled "like a golf ball" to relieve stress from the dome.
The Pantheon still has the largest reinforced concrete dome in the world. Some of the Roman temples were circular and had a dome, like the Pantheon. Knowledge of how to make Roman concrete was lost during he Middle Ages and domes were no longer built in western Europe for centuries. Then between 1446 and 1461 Brunelleschi built a dome for Florence Cathedral which was even bigger than that of the Pantheon. This was a big achievement because his dome is made with bricks. Brunelleschi had studied the dome of the Pantheon and other Roman architecture prior to his undertaking. Since then several churches and secular buildings (including the Capitol on Washington) have been built with domes. This was inspired by Roman architecture.