
Mule Pass Tunnel is a historic railroad tunnel cut through desert rock near Bisbee, offering a strong architectural arch framed by rust-red hills and open sky. Photograph the tunnel mouth against sunrise/sunset side light to bring out textures; shoot through the tunnel for dramatic leading lines and vanishing-point compositions. Accessible from AZ‑80 with informal roadside parking; watch traffic, bring a headlamp for interior shots, and expect minimal crowds. No entry permit but respect private/

Mule Pass Tunnel is a historic railroad tunnel cut through desert rock near Bisbee, offering a strong architectural arch framed by rust-red hills and open sky. Photograph the tunnel mouth against sunrise/sunset side light to bring out textures; shoot through the tunnel for dramatic leading lines and vanishing-point compositions. Accessible from AZ‑80 with informal roadside parking; watch traffic, bring a headlamp for interior shots, and expect minimal crowds. No entry permit but respect private/