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If you are a physicist or just interested in physics, come to the Institute and see the room of Niels Bohr with photos of the staff of the institute when he was the head of it, a model of the famous thought experiment weighing the clock, the archive, the photos of all the famous people who were developing the quantum theory during the so-called "golden age of physics, when even small people could do big things" and also the modern part of the institute. The people at the archive are willing to show the institute to other people, if they are not too busy.
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Museum for Postal, Tele, and Communications
So far only stage one of the new telecommunications museum is implemented. Which means that there is exactly one item on display, an old rusty Enigma machine. But it is free and they have a nice cafe and a museum shop with lots of expensive modern design. So if you are in the area it is worth a visit.
Fæleldparken is the big park behind the football stadium, the largest in Copenhagen. There is a lake, big trees and a pavilion with a cafe which hosts concerts during the summer, the outfit Salsa Brava also gives Salsa lessons in the park during the summer. Most of it is covered with grass, much of it marked as football fields. Go there for a game of football or another game, a picnic, or just lie in the grass. At May 1st, during the International Workers day, most of Copenhagen's population comes here in a peculiar mix of a political rally, and a seriously huge party.
Brumleby is a small quarter nestled in a triangle between Trianglen square and the National Stadium. It was built in the 1850s by the Danish Medical Association, as answer to a recent cholera epidemic, as a showcase on how to make healthy but affordable housing for the working class. It has been awarded Europa Nostra award for conservation, and it is a nice place for a brief stroll if you are in the area.
Small museum in the old cooperative shop and library. It is run by volunteers living in Brumleby and they are happy to tell you everything about the museum and Brumleby.
Denmark's international soccer games are played at this 35,000-seat stadium. It's also the home ground of FC Copenhagen, who play in Superliga, the top tier. It hosts major concerts, and has a gym, bowling alley and a pool.
The only cinema on Østerbro, has an atmospheric lobby with tall plants, caged birds, and a café. Plays many Danish and European movies.