Piazza del Popolo is a large oval square at the northern gate of Rome, with an Egyptian obelisk at its centre and a fountain of stone lions around its base. Stand under it and three straight streets fan out in front of you, the arrangement Romans call the trident. Two domed churches flank the middle street and read as a matching pair from here. Giuseppe Valadier gave the square its present shape in the early 1800s, curving the two long sides into the oval you are standing in.
The name most likely comes from the poplar trees that once shaded the spot. For centuries this oval was the first piece of Rome that travellers saw, arriving from the north through the gate in the Aurelian walls. The obelisk was carved for a pharaoh, shipped here by Augustus and raised on this spot in 1589. Santa Maria del Popolo, the church beside the gate, holds two Caravaggios in a side chapel. Traffic once cut through the square; it belongs to people on foot now, and the evening crowd drifts up to the Pincio terrace for the view down over the whole oval.