Please do not take the title literally; this is not about applying extreme vignetting in order to simulate loss of peripheral vision. What I want you to share is your pictures of tunnels (and of what is or is not happening inside/around them). Photos can be taken from within or outside a tunnel, but please let the tunnel be a significant part of your picture's theme, not just a barely visible...
Show us your captures of life in castles or palaces, i.e. at least part of a castle/palace must be depicted (either interior,exterior, or both) together with some form of living activity; the latter can be (whole or parts of) people, animals or flowers.