The German-Spanish Astronomical Center at Calar Alto, Spain includes location, visitor information, equipment description, newsletter, and news operated by the Max Planck Institute for Astronomy.

International partnership comprised of two 8.1-meter telescopes with equipment description and location, news, press releases, and newsletter.

Facility information, equipment and instrumentation, observer information, and research. They have a 9.2 meter telescope as well as smaller ones.

Is 6.5 meters in diameter and provides historical information, public access information, and visual resources.

Acenter of astronomical research owned and operated by Caltech. The Observatory is home to three active research telescopes: the 200-inch (5.1-meter) Hale Telescope, the 48-inch (1.2-meter) Samuel Oschin Telescope, and the 60-inch (1.5-meter) telescope. Near San Diego, California.

A Very Large Telescope will consist of four 8-meter telescopes which can work independently or in combined mode, and includes information on observing, the site, and the project.

Information on facility and equipment, news, science, observing, and inauguration.

Is 8.2 meters, and includes general information, equipment and instrument information, presentations, and images.

Comprised of two 10 meter telescopes includes information on equipment and instruments, with images and movies, observing information, and news.