Sir John Soane Museum, London. (I think it's either Soames or Sloane, never mind, it's a great place like none other, little house full of treasures, even old masters, Paintings, that is, not the boss.)
Most hotels have moved away from the traditional key system. This is due to the fact that the keys can easily be stolen and sold to thieves wanting to rob the hotel. Instead, most hotels have adopted the keycard system, which allows the key to be "rekeyed" with each new guest. If using the old system, avoid putting a room number on the key or cross code the keys.This will make it harder for a potential thief to find the room.