Piazza della Rotonda, Rome, Fontana del Pantheon surmounted by an Egyptian obelisk by Pharaoh Ramses II for the Temple of Ra in Heliopolis.

The Piazza della Rotonda is a piazza (city square) in Rome, Italy, on the south side of which is located the Pantheon. The square gets its name from the Pantheon's informal title as the church of Santa Maria Rotonda.
Although the Pantheon has stood from antiquity, the area in front of it had over the centuries become choked with a maze of sheds and small shops that had grown up around its columns. These medieval accretions were cleared by order of Pope Eugenius IV (1431–39) and the piazza was laid out and paved. It took its name from the Pantheon, which had been converted in the 7th century AD into a Christian church dedicated to "St. Mary and the Martyrs" but informally known as Santa Maria Rotonda. The piazza is roughly rectangular, approximately 60 meters north to south and 40 meters east to west, with a fountain and obelisk in the center and the Pantheon on the south side.

In the center of the piazza is a fountain, the Fontana del Pantheon by Filippo Barigioni, surmounted by an Egyptian obelisk. The fountain was constructed by Giacomo Della Porta under Pope Gregory XIII in 1575, and the 20-foot red marble Egyptian obelisk was added to it in 1711 under Pope Clement XI.
The obelisk, originally constructed by Pharaoh Ramses II for the Temple of Ra in Heliopolis, had been brought to Rome in ancient times where it was reused in the Iseum Campense, a shrine to the Egyptian god Isis that stood to the southeast of the Pantheon. It was rediscovered in 1374 underneath the apse of the nearby Basilica of Santa Maria sopra Minerva. In the mid-15th century, the obelisk had been erected in the small Piazza di San Macuto some 200 meters east of the Pantheon, where it remained until its 1711 move to the Piazza della Rotonda. It is still called the Obelisco Macutèo after its previous location. Originally one of a pair at the Temple of Ra in Heliopolis, the other being the now much shorter Matteiano obelisk (now located at the Villa Celimontana).

More on https://en.wikipedia.org/wiki/Piazza_della_Rotonda , https://en.wikipedia.org/wiki/List_of_obelisks_in_Rome