Electricity in Greece is very expensive so all of the hotels have installed a unique system to make sure that when you are not in the room, no electricity is being used. Each room key has a heavy weighted magnet attached that you install into a special switch as you enter your room. This switch controls the main circuit breaker for the room and turns on the juice for the room. Instead of keeping the key during your stay, they request you leave the key at the hotel desk. Americans would never stand for a system like this. Leaving the television and every light on when leaving a hotel room is the name of the game in the states.