Rotterdam the most sustainable city break you can take, ranking says

Rotterdam has a wealth to offer, starting with its striking suspension bridge. – Photo: Soeren Stache/dpa

Rotterdam is the best city break destination you can pick when it comes to sustainability, followed by another Dutch city, Amsterdam, according to new ranking from search engine Kayak.

In third and fourth place are Graz in Austria and Munich in Germany, while Norway's Trondheim comes out fifth in new research on city destinations for mindful travellers.