During the day you can take a guided tour of the huge research telescopes, including the Southern African Large Telescope, but it's the two-hour night tours that are the real draw. After a short video, you head outside to take a sky safari, thanks to two 16in telescopes. Times vary depending on the time of year and bookings are essential. Dress very warmly, even in summer.
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South African Astronomical Observatory
Top choice in Northern Cape