Hidden Valley Observatory

Hidden Valley Observatory is an astronomical observatory owned and operated by Black Hills Astronomical Society. It is located just outside Rapid City, South Dakota (USA). It is named after the road on which it was built in the 1960s.

Hidden Valley Observatory

Hidden Valley Observatory is an astronomical observatory owned and operated by Black Hills Astronomical Society. It is located just outside Rapid City, South Dakota (USA). It is named after the road on which it was built in the 1960s.