The Pantheon Feature is a structure in Rome, Italy that was built in 126 AD. It consists of a large DOME, a rotunda, and a PORTICO. The DOME is a hemispherical roof made of concrete and is the most recognizable feature of the Pantheon. The rotunda is a circular room with a domed ceiling and is located directly beneath the DOME. The PORTICO is a porch-like structure with columns and is located at the entrance of the Pantheon.