Shadow Temple

You will find the Shadow Temple in the back of the graveyard in Kakariko Village in a little alcove only accessible using the Nocturne of Shadow. It is filled with undead creatures and deadly traps and mind-bending puzzles everywhere, all designed to trap everyone in the overfilled crypt. It is also filled to the brim with invisible walls and passagways only seeable using the Lens of Truth. The boss of the temple is Bongo Bongo, a giant dead monster with two disembodied hands, a giant body, and one protruding eye, and he beats on a giant drum. Only those who can survive the traps can face this deadly creature, and will probably never defeat him...

In one room, there appears to be a tortuing device, with a pool of blodd around it. Creepy...