The abandoned Caversham railway tunnel
Hiding in plain sight. This sneaky tunnel is dug though 865 meter of solid sandstone below Lookout Point back in 1871. Now just sitting here locked up on both ends, with only a handful of people trying to open it. The city has deemed it to much of a bother to deal with. With having a death toll of 3, mostly people falling from the train as it passed through the tunnel. Either way you look at it, it's there and we should be using it for something. Get out and go have a look. It's pretty neat really.