Vatican Observatory History
- From calendar reform in 1582 to modern telescopes in Arizona
- http://clavius.as.arizona.edu/vo/R1024/History_p1.html

History of the Leander J. McCormick Observatory
- Early astronomy at the University of Virginia.
- http://www.astro.virginia.edu/research/observatories/26inch/history/

Dudley Observatory
- Library, archives, outreach programs.
- http://www.dudleyobservatory.org/

Armagh Observatory History and Architecture
- Instruments, astronomers, a list of original sources archived.
- http://www.arm.ac.uk/history/