Meliá Barcelona Sky
This glassy 29-story skyscraper hotel rises high above Avenida Diagonal in the less-touristy Poblenou district. It's actually two hotels in one, with four-star accommodations on the lower floors, while the five-star "The Level" (floors 14–29) offers a private check-in area and lounge with free drinks and snacks. All rooms are designed in a contemporary style, with a neutral palette, and those on the upper floors have fantastic views—of the sea to one side, or the skyline and mountains to the other.