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Year: 1963, Location: Arecibo, Puerto Rico, Significance: Featured the world's largest single-aperture radio telescope until its collapse in 2020.

Year: 1990, Location: Low Earth Orbit, Significance: Provided deep and clear views of the universe, leading to many astronomical discoveries

Year: 1897, Location: Williams Bay, Wisconsin, USA, Significance: Home to the world's largest refracting telescope

Year: 1904, Location: Mount Wilson, California, USA, Significance: Contributed to important discoveries about the size of the Milky Way and the nature of galaxies.

Year: 1987, Location: Mauna Kea, Hawaii, USA, Significance: The largest single-dish submillimetre telescope in the world, important for studying the early Universe and star formation.

Year: 1993, Location: Mauna Kea, Hawaii, USA, Significance: Its twin telescopes are among the largest optical and infrared telescopes available today.

Year: 2000, Location: Green Bank, West Virginia, USA, Significance: The world's largest fully steerable radio telescope and an important tool for radio astronomy.

Year: 1675, Location: London, United Kingdom, Significance: Played a major role in the history of astronomy and navigation, marking the Prime Meridian of longitude.

Year: 1961, Location: Parkes, New South Wales, Australia, Significance: Its radio telescope played a key role in the Apollo 11 moon landing communication.

Year: 1888, Location: Mount Hamilton, California, USA, Significance: The world's first permanently occupied mountain-top observatory.

Year: 1945, Location: Cheshire, England, Significance: Its Lovell Telescope was the world's largest steerable dish radio telescope upon completion.

Year: 1960, Location: Kitt Peak, Arizona, USA, Significance: Features the world's largest collection of optical telescopes and is a hub for US astronomical research.

Year: 1948, Location: Palomar Mountain, California, USA, Significance: Its 200-inch Hale Telescope was the world's largest effective telescope for decades.

Year: 1999, Location: Sudbury, Ontario, Canada, Significance: Played a key role in the detection of neutrinos and understanding of their properties.