Walking inside the Donner Summit Tunnels

The tunnels were built in 1867 to accommodate the first train passage through the Sierra Nevada Range. Built primarily by Chinese laborers, nothing but hand drilling methods and explosives were used to carve through the granite-based Mount Judah. The tunnels saw the first train traffic shortly after completion in 1868, and were used as recently as 1993, when they were then decommissioned. Today, the property is still owned by Union Pacific, who have been kind enough to allow people to freely explore the tunnels.