The River of Souls

Once there were two sorcerers, twin siblings in each built a tower in which to live and practice their arts. These two towers stood many miles apart, but as time passed, the link between the siblings created a link between the towers. Over the centuries, or over many years, they drew closer and closer together. Today when the sorcerers died, other people moved into these towers and built onto the structures so they grew and grew. Many more years passed than the towers developed into a sort of vertical city. Hundreds of feet tall. A whole city? However, the distinct nature of being two towers means that they are,  side by side in their own way. So one looks