Snakes in a cave! Part execution, part nightmare, the Cave of Roses required locking victims in a dark cave filled with a smorgasbord of venomous creatures and other unpleasant creatures. With no way to escape and no way to see, the condemned knew it was only a matter of time before their movements provoked some creepy crawly to deliver a fatal bite. The Cave of Roses was finally abolished in 1772, and fortunately, Sweden grew a lot more enlightened with time. Exactly 200 years later, it became one of the first major European nations to ban the death penalty completely.