An icon from the Roman Empire. Built by Marcus Agrippa, destroyed, and rebuilt by Emperor Hadrian in 126 AD. Originally consecrated as a temple to all the gods of ancient Rome, now a Roman Catholic church dedicated to "St. Mary and the Martyrs" but populary called "Sta. Maria della Rotonda" after the square in its front Piazza della Rotonda.
Almost two thousand years after it was built, the Pantheon's dome with its open oculus over the rotunda, is still the world's largest unreinforced concrete dome.
The porticos great granite Corinthian columns were quarried in Egypt at Mons Claudianus in the eastern mountains. Each was 12 m tall, 1.5 m in diameter, and 60 tons in weight.
These were dragged more than 100 km from the quarry to the river on wooden sledges. They were floated by barge down the Nile River when the water level was high during the spring floods, and then transferred to vessels to cross the Mediterranean Sea to the Roman port of Ostia. There, they were transferred back onto barges and pulled up the Tiber River to Rome.

After being unloaded near the Mausoleum of Augustus, the site of the Pantheon was still about 700 meters away. Thus, it was necessary to either drag them or to move them on rollers to the construction site.