Marvel at the size of Orthodox Cathedral. Go to a service if you can or simply take a seat and appreciate the serenity.
This principal church in Old Town Constanta is well-liked by travelers, so make a spot for it on your schedule. Don't think that's all there is to do here, though. There are a lot more places ready for you to enjoy after Orthodox Cathedral. Mamaia Beach, Constanta Beach, and Constanta Casino are nearby.