Spain

Perhaps no single edifice has had more impact on a city than the Guggenheim Museum of Bilbao. Designed by renowned architect Franck Gehry and opened in 1997, the massive, billowing, titanium-clad structure reflects the city’s revitalized relationship with the river that runs through it, and the modern collection within the museum is as impressive as the exterior. Other worthwhile museums include the Museo de Bellas Artes and the Euskal Museoa, devoted to Basque culture.

Las Palmas, the capital city of Gran Canaria island, is a bustling city that weaves the vibe of the Spanish mainland into a unique tapestry of life informed by world cultures including African, Chinese and Indian. A city of superlatives, it's one of Europe's biggest ports with one of the world's best climates and the cleanest air of any Spanish city according to a WHO study. Many also believe that the long, wide stretch of Las Canteras is one of the world's great urban beaches.