Nevsky Prospect
The cathedral was the cathedral church (i.e., the seat of the bishop; the term "cathedral"—"sobor" ("собор") in Russian—can mean the seat of a bishop, but it can also mean simply a large or important church) of the city until 1859 (when St Isaacs became the city's cathedral.) The current cathedral church of St. Petersburg is the Kazan Cathedral on Nevsky Prospect.