An ancient pyramid situated near Porta San Paolo and the Protestant Cemetery. It stands at a fork between two ancient roads, Via Ostiensis and a road that ran west to the Tiber along the approximate line of modern Via della Marmorata. Due to its incorporation into the city's fortifications, it is today one of the best-preserved ancient buildings in Rome.
Rome's gasometro is a huge metallic structure situated in Ostiense area, near the river Tiber. About 92 meters tall, it's the tallest in Europe, altought is not used anymore. Today is one of the symbols of industrial Rome of the first decades of XXth century and used sometimes for cultural events, as the 2006 "White Night" when it was filled of white light shining in the dark.