Mt. Palomar Observatory
Griffith Observatory
Griffith Observatory
Observatory
Observatory
Radcliffe Observatory, Green College, Oxford
Royal Observatory, Greenwich
Mauna Kea Observatory
Jantar Mantar observatory
Observatory
Observatory
Ancient observatory Kokino
Astronomical observatory
Holcomb Observatory and Planetarium on the Butler University campus
Telescope Dome, Greenwich Observatory
Vesuvius Observatory
Royal Observatory and hour marker, Greenwich
Royal Greenwich Observatory
Griffith Observatory
El Caracol observatory temple in Chichen Itza
El Caracol observatory temple in Chichen Itza
Griffith Observatory
Mt John University Observatory Retro
Royal Observatory Greenwich
Astronomical observatory