http://www.nso.noao.edu/nsokp/nsokp.html
NSO at Kitt Peak: The National Solar Observatory at Kitt Peak is where you will find the largest solar telescope, McMath-Pierce telescope.

http://www.sunspot.noao.edu/index.html
NSO at Sacramento Peak: Sunspot, New Mexico is the location for the National Solar Observatory at Sacramento Peak. The site provides current H-alpha images.

http://hiraiso.crl.go.jp/
Hiraiso Solar Terrestrial Research Center Space Environment Information Service

http://www.bbso.njit.edu/
Big Bear Observatory

http://www.hao.ucar.edu/public/research/mlso/mlso_homepage.html
Mauna Loa Solar Observatory

http://www.solar.ifa.hawaii.edu/mees.html
Mees Solar Observatory

http://ftp.solobskh.ac.at/
Kanzelhohe Solar Observatory (Austria)