Helsinki, Finland

Finland celebrates 100 years of independence on December 6, 2017, but the parties will start much earlier—and many of them will be happening in Helsinki, the capital. The country's gift to itself is a major new landmark: the sinuous Central Library, designed by ALA Architects to be Helsinki’s new living room (it will open in 2018). Sauna culture is a big part of everyday life in the city. The latest and greatest public one is Löyly, a contemporary geometric complex of wood designed by Avanto Architects. And on Sauna Day, which takes place twice a year, several unique private saunas, including one on a raft and another in a castle, open to the public. When it comes to a design-savvy place to stay, book a room at Lilla Roberts, at least until the summer opening of sister hotel St. George, a grand 150-room property in a 19th-century landmark building. —Gisela Williams