Saint Gregory of Narek Cathedral is one of Vanadzor's main Armenian Apostolic churches, a modern cathedral named for the medieval mystic poet and saint. Its pale stone, conical dome, and clean lines give the city a visible religious landmark without pretending to be ancient.
The cathedral is worth a short visit while walking through central Vanadzor, especially if you are comparing the city's Soviet-era civic spaces with its post-independence religious architecture. It is an active church, so the usual rules of modest dress and quiet behaviour apply.