Reddit reviews Book of Challenges: Dungeon Rooms, Puzzles, and Traps (Dungeons & Dragons d20 3.0 Fantasy Roleplaying)
We found 3 Reddit comments about Book of Challenges: Dungeon Rooms, Puzzles, and Traps (Dungeons & Dragons d20 3.0 Fantasy Roleplaying). Here are the top ones, ranked by their Reddit score.
Used Book in Good Condition
There's a similar thread here. If you've got the cash, you could try Grimtooth's Traps or The Book of Challenges.
http://www.amazon.com/gp/aw/d/0786926570?pc_redir=1410497506&robot_redir=1
> Goblins
Actually, I think they'd be more likely to strike as soon as the party makes themselves comfortable - as in, they settle down for the night - after clearing a large infestation.
> Recruiting soldiers at different cities
And, IIRC, pay for a trained soldier is between 1 silver and 1 gold coin (1 gp = 10 sp)... at least in 3.5.
----------------
No idea what edition are you playing, but Stronghold Builder's Guide has plenty of material not restricted by editions. Book of Challenges also has a pile on info for making in-built castle and dungeon protection mechanisms (read: traps).
Finally, take a look at Stirling Castle, Scotland. I came across it fairly recently, been drooling ever since. It looks amazing. Only needs some adjustments for a fantasy setting - for example, protection against flying enemies.
Happy DMing! :)