Identify.

Pantheon, 118-128 CE, unknown architect, temple to all the gods, has a great influence on later architecture, later used as a church (still used as a church), concrete brick, monolithic columns, part of a larger complex during antiquity (rectangular forecourt), potentially had an arch and altar where the fountain is now, was on a high podium during antiquity (now underground), triple cornice & arches (needed during construction, provide support, distribute weight), interior (opus sectile, oculus, coffered ceiling [impression molds into concrete], bottom of dome has basalt [heavier than the top], gods and emperors in niches on top register)