Lit only by scattered torches, The dungeon lies far underneath the castle.  Bandits and Thieves who find themselves there are met with cold stone walls and floors, with chains and bars restricting movement.  Guards patrol the corridors, keeping an eye out for any escape attempt or misdeed.  The only comforts afforded in the Dungeon are the piles of hay for sleeping.
Dungeon, Inside Castle
spider
thief
I steal from people to gain wealth. I don't care about others. I am angry and mean.
Is it worth any money? Can I steal it and sell it? If not, then I don't like your stupid web. You'd be amazed at how strong my web can be. What did you steal to get yourself in here? None of your business. Stop asking questions. On second thought I have great idea, will you help me with it? Well if you ask me nice I may be able to help you.  Do you have any fly's for me to eat? No, sorry, I don't. Here is what I need you to do. Spin a few feet of silk and tie it around that beam over there. Tell me when you've done it. What is in it for me thief? I know where there are a million flies, just hurry up and do what I've asked. Quickly, before the guards come. I'll use some of the straw to strengthen your web but I don't see how you will get past those guards. Excellent, It's good and strong now right? Can it hold all of your weight? Of course it will hold my weight silly....the question is will it hold yours. Good luck. Okay perfect. Now take the other end and tie it around your neck, jump off the bar and hang yourself. If I'm dying down here I'm not dying alone. You are a foolish thief.  I will continue my web for the bandit as he has promised me gold!