If the drapery rod is mounted above the arch and given enough room on the sides of the window for "stack-back", you will see the window just fine when the drapes are open. When they are closed you won't, but I'm not sure what else you can do. You will most likely want some fabric treatment at some point, unless you have a more contemporary look.

Those are really huge windows, so whatever you choose will be costly.

I lived in the middle east where arched windows are the norm and the solutions never obscured the shape. The best answers are custom 'Shutters' that are made to fit the shape. They can be wood, metal or a frame with translucent/transparent fabric. Whatever your taste, whatever you do, don't obscure the beautiful shape of the arch. That is something I missed back here.

Good luck,
Dogitnice

I agree with sallymo that fabric treatment probably would be the best choice for you. Mounting blinds above the arch would not look good. Blinds are good for light control and insulation. But they don't look as nice as fabric treatment. If these windows are not in your bedroom, you don't have to worry too much about covering them up with blinds. Ceiling to floor curtains look formal and can also provide light control and insulation when you close them. I have arched windows in my living room and dinning room. I have a layer of sheer fabric inside my curtains and I leave the sheer closed all the time for privacy and keep the heavy weight curtains open. If you want to mount the blinds above the arch, you need to cover the blinds with some top treatment at least.

I put stained glass in my arched window over my front door and I will be putting it in the 2 windows that are on either side of the fireplace, I have one more fully arched window in the family room that I am leaving alone, I'm looking at putting some sort of UV protection on it.