The hidden bus-shelter on Busty Bank near Gibside.
At a glance, it would appear to be just another overgrown hedge as the brickwork is not at all visible. However, on further inspection...
Admittedly, not the best photo, but you can see the brickwork and the remains of a wooden bench inside the shelter itself.
I couldn't really venture any further into the shelter so that's the best I could achieve.
If I was still 15 years old and looking for somewhere to stay dry while downing a bottle of Pulse on a Friday night, I think that shelter would provide for my needs.