Kelvin Smith's Untraveled Road
- Virtual walking tour of this Sonoran Desert preserve on the Mexico border, including Alamo Canyon.
- http://www.untraveledroad.com/USA/Parks/Monuments/PipeOrganCactus.htm

Organ Pipe Cactus National Monument
- Official NPS site. Visitor information and background on the natural history of this Sonoran Desert area.
- http://www.nps.gov/orpi/

AmericanSouthwest.net- Organ Pipe Cactus NM
- Description, photographs and QTVR panoramas.
- http://www.americansouthwest.net/arizona/organ_pipe/national_monument.html

DesertUSA - Organ Pipe Cactus National Monument
- Guide features color photos, climate, history, hiking, links, and mileage guides to nearby attractions.
- http://www.desertusa.com/organ/du_org_main.html