Oslo

A 430 km² forest reserve reached directly by metro line 1 to Frognerseteren. Outside båndtvang season (21 August-31 March) dogs can roam off-leash on hundreds of kilometres of trails, and in winter marked ski tracks include parallel lanes for mushers and skijoring.

A 25-hectare hillside park above the fjord with 45 sculptures by Rodin, Dalí and Louise Bourgeois. Dogs on leash are welcome on all trails, and the viewpoint by Salvador Dalí's Venus gives the classic skyline photo.

A harbour-front boardwalk in the Bjørvika district with a floating seawater pool. Dogs cannot enter the swim platform but the adjacent Sørengkaia steps let them paddle in the fjord, and the whole promenade is a lively people-and-dog parade in summer.

The world's largest sculpture park by a single artist, with 212 Gustav Vigeland bronzes and granites set in the 45-hectare Frognerparken. Dogs on leash are welcome everywhere outdoors, and the lawns south of the Monolith are a popular picnic spot with them.

A medieval fortress begun around 1290 and still an active military headquarters, perched over the Oslofjord. Leashed dogs may walk the ramparts, courtyards and waterfront promenade free of charge, though not inside the castle museum.

Oslo's hipster-turned-family district lined with vintage shops, vegan cafés and independent bookstores. Its green heart, Sofienbergparken, includes a large fenced off-leash enclosure that fills up every evening with local dogs and their owners.