Summit restaurant on Nebelhorn summit, 2224m, Oberstdorf, Swabia, Bavarian Alps, Bavaria, Germany, Europe

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

View from the Observatory Deck of the John Hanckock Tower onto the high-rises of the loop district, Chicago, Illinois, USA

View from the Observatory Deck of the John Hanckock Tower onto the high-rises of the loop district, Chicago, Illinois, USA

View from the highest observatory of the world on 562 meters height in the 632 meters high skyscraper Shanghai Tower on the special economic zone Pudong with the 468 meters high Oriental Pearl Tower the Huangpu River and the district Tilanqiao, Shanghai, People's Republic of China

Die große Sonnenuhr von Jantar Mantar, Jaipur, Rajasthan, Indien

Observatory on the Roque de los Muchachos with clouds at sunset, Caldera de Taburiente National Park, La Palma, Canary Islands, Spain, Europe

Mauna Kea Observatory, Subaru Telescope, Keck Observatory and Infrared Telescope Facility, Mauna Kea Ice Age Natural Area Reserve, Big Island, Hawaii, USA, North America

View from the highest observatory of the world on 562 meters height in the 632 meters high skyscraper Shanghai Tower to the special economic zone Pudong with the 492 meters high Shanghai World Financial Center, nicknamed The Bottle Opener, Shanghai, People's Republic of China

Ernst Abbe Bronze Statue by Klaus-Dieter Locke, Jena Zeiss Planetarium, Jena, Thuringia, Germany, Europe

Sunset at the observatory in front of the summit of Mount Teide, Tenerife

Roque de los Muchachos Observatory, La Palma Astrophysical Observatory, the Telescopio William Herschel (WHT), La Palma, Canary Island, Spain, Europe

Observatory in front of the summit of Mount Teide, Tenerife

Reflecting telescope, astronomical observatory on the Roque de los Muchachos, La Palma, Canary Islands, Spain, Europe

Roque de los Muchachos Observatory, La Palma Astrophysical Observatory, the Telescopio Optico Nordico (NOT), La Palma, Canary Island, Spain, Europe

Observatory Forca Aerea on the Pico do Arieiro, Parque Natural da Madeira, Madeira, Portugal, Europe

Observatory, Observatory on the Roque de los Muchachos, Gran Telescopio Canarias, La Palma, Canary Islands, Canary Islands, Spain, Europe

Roque de los Muchachos Observatory, La Palma Astrophysical Observatory, the Grand Telescopio Canarias (GTC) and sign, no passing, La Palma, Canary Island

Planetarium, Venet Star Park, Tyrol, Austria, Europe

Observatory, Observatory on the Roque de los Muchachos, Gran Telescopio Canarias, La Palma, Canary Islands, Canary Islands, Spain, Europe

Observatorio del Teide, Teide Observatory, Observatory on Mount Izana, Tenerife, Canary Islands, Spain, Europe

Observatories, Observatory on the Roque de los Muchachos, Gran Telescopio Canarias, La Palma, Canary Islands, Canary Islands, Spain, Europe

Roque de los Muchachos Observatory, La Palma Astrophysical Observatory, the Telescopio Nacional Galileo (TNG), La Palma, Canary Island, Spain, Europe