Atlas Obscura
The University Observatory (Observatoriet) in Frogner, Norway
Free tours are regularly arranged at this 1833 observatory right behind Solli plass (check the official website). Although the observatory is today in the heart of Oslo, at the time of its construction the building would have dominated its surroundings; in fact, the observatory predates the 1849 completion of the royal palace. Designed by Christian Grosch (who also designed the University build…