When we think “Evil Lairs” most of us fondly remember Dr. Evil’s hollowed out mountain with his face on it from the Austin Powers movies (at least I do). In reality there are plenty of actual evil lairs to marvel at. My favorite is H.H. Holmes' Murder Castle.
This was no ordinary hotel: most of the rooms were windowless, with stairways to nowhere and hallways that ended in dead ends. Holmes also built gas jets into hotel-room walls, a wooden disposal chute and person-size kiln in the basement. This was the perfect place to murder someone.