How do I list the workspaces for an organization?

How do I list all of the workspaces for an organization so that I can delete the ones that I no longer need? There doesn’t seem any obvious way of doing this. If you don’t know the workspace name there is no way to ever get back to it. I was hoping to find it under Account Management but I can’t find a way of knowing what workspaces actually exist. This seems like a pretty basic capability.