Botanic Sanctuary Antwerp

City-center boutique hotels don’t get much greener than the Botanic Sanctuary Antwerp, set within the walls of the city’s botanical gardens. Here a monastery complex, some of whose buildings date back as far as the 12th century, has been transformed into a 21st-century luxury hotel, alongside a spectacular modern spa. The rooms and suites are delightfully varied and uniformly luxe, the spa is nothing short of sublime, and the hotel’s four restaurants are impressive as well, featuring outposts of the Antwerp-based Hertog Jan and and Fine Fleur (with three Michelin stars between them).