In time for its fifth anniversary, the Mandarin Oriental in Barcelona is expanding to include a further 17 suites, housed in a modernist building next door. Once again outfitted by Spanish designer Patricia Urquiola, the new suites feature warming woods, tactile upholstery and a palette of greys with lime-green accents, while the furniture is a mix of bespoke pieces by Studio Urquiola, along with Flos lamps, Moroso sofas and tables, and 'Husk' chairs for B&B Italia. Each suite comes with a private butler and lift access, but for the best experience, we recommend the signature Barcelona suite, which comes complete with its own outdoor Jacuzzi and solarium.