The Bullio Road Tunnel, a historic single-lane sandstone tunnel, is located along Wombeyan Caves Road in High Range, New South Wales. Completed in 1899, it was part of a new tourist road linking the Southern Highlands to Wombeyan Caves. The tunnel is approximately 22 meters long at ground level, with a sandstone outcrop extending several meters further at its western end. A plaque at the eastern end of the tunnel commemorates its completion and the road's original name, Duprez Road, in honor of Adolphe Prosper Duprez of Bowral, who was instrumental in its construction.
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