Eidsvolls plass
Eidsvolls plass is a park in Oslo. Stand here, tap Check in, and the stamp is in your passport.
Save it as a wish now, and check in when you are there. No account needed to look around.

From Wikipedia
Eidsvolls plass ("Eidsvoll Square") is a square and park in Oslo, Norway, located west of the Parliament of Norway Building, south of Karl Johans gate and east of Studenterlunden and the National Theatre. It has been referred to as "the National Mall of Norway".
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Facts
From OpenStreetMap, where anyone can add and correct details.
Part of Parks in Oslo
176 places to collect
Green breathing space, from city squares to big lawns.