The functionalist building of the National Museum of Agriculture has been recently reconstructed and there has been created a unique garden at the rooftop. The terrace offers unique and attractive views at Prague, incl. the Prague Castle, Petřín or Old Town. The garden with soft grass, a herb garden, a picnic area is great for relaxation. What is also interesting is that there are also bee hives.
Source: https://www.prague.eu/en/object/places/3040/the-lookout-terrace-with-a-garden-on-the-roof-of-the-national-museum-of-agriculture