How was the pantheon made?

The Pantheon in Rome was originally built as a temple to all the gods of ancient Rome. Its construction began under Agrippa around 27 BC and was later rebuilt by Emperor Hadrian around 120 AD after a fire. The building features a massive concrete dome with a central oculus, showcasing advanced Roman engineering techniques. Its design and materials, including lightweight pumice and volcanic ash, contributed to its remarkable structural integrity and longevity.