The Palm House
This sextant-shaped building is called The Palm House (Palmhuset), but I'm not sure why. It doesn't look anything like a real palm house. Perhaps I'm overanalyzing?
The location is Norrmalmstorg, a square that became internationally famous in 1973 because of a bank robbery. Some of the hostages expressed empathy towards their captors, and even defended them once they were caught by the police, thus giving rise to the so-called Stockholm syndrome.