The Jewish Synagogue in Rome stands out. It is the only church in the city with a square dome, meant to be intentionally different and separated from the infamous round Roman domes. It was on my list of things to visit for an entire year and for some reason I never got around to it until the very last week of living there.
I love the location too: right by the Tiber River, Tiber Island, Trastevere, in the Jewish Ghetto, and walking distance from the heart of Rome with either Teatro Marcello, Circo Massimo, or Piazza Venezia in the other direction.
Jews have lived in this city for 2200 years. This synagogue was built in 1904. Here are some photos of the details you will find when you visit.
You can find The Great Synagogue of Rome at this address: Lungotevere de’ Cenci, 00186 Roma, Italy. They are open Sunday – Thursday, 10AM-5PM and Friday 9AM-2PM. Closed on Saturdays, to celebrate the Sabbath. The entrance for the museum is in the back. Full price: € 11.00, Students: € 5.00. For more information and reservations, visit the museum’s website here: http://lnx.museoebraico.roma.it/w/