- Observatoire Royal/Koninklijke Sterrenwacht
- (Avenue Circulaire 3)Located in Uccle, the Royal Observatory was built between 1883 and 1890 under a design devised by architect Octave van Rysselberghe. Other buildings were added later.The symmetry of the park's design is reflected in its shape, which is modeled on the planets under study.
Historical Dictionary of Brussels. Paul F. State.