[this prolly isn't where this goes but owell]
Not too long ago, I got sick of Ruenge and decided to "close shop".
Here's the fun part: on my way out I hid a total of 5 gold blocks in various places around the city (under floors, inside walls etc.) and I also knocked out all the torches.
This means there is a total of 45 gold hidden within the now mob-infested ruins.
You can just dig through a ceiling or tunnel through a wall to get in, but to have the most fun (and be the best sport) you should use the entrance I've indicated below (you are on your own for finding the under water entrance to the chamber where this pic was taken).
Just break that chest and the dirt under it, and have yourself an adventure!
PS: cool kids don't put up new torches.