Currently it is almost unthinkable to imagine a hotel without an elevator or without a bathroom in the room. But there is always a first time, a first hotel that introduces a novelty that lasts until today. Do you know which was the first hotel that had a key in the rooms? Or the first to have a phone in every room? If you want to know the answers, we recommend that you keep reading! We reveal to you some of the most innovative hotels in the history of the hotel industry.