observatories 21 astronomy 7 architectural designs 4 research of universe 4 astronomical instruments 3 radiotelescopes 3 gamma rays 3 more ... architecture 2 astrophysics 2 astronomical observatories 2 astronomické observatoře 2 buildings (architecture) 2 history 2 stars 2 tinsmith works 2 roof covering 2 cupolas 2 rebuildings 2 X ray radiation 2 civil engineering 2 roofs 2 Milky way galaxy 1 astrometry 1 astronomers 1 astronomical observations 1 astronomical telescopes 1 astronomical optics 1 astronomická pozorování 1 astronomické dalekohledy 1 astronomové 1 less ...