Great Structures - Canal tunnels: subterranean passageways built for water transport
Great Structures · 0:41
Canal tunnels are subterranean passageways constructed to help navigable waterways cross difficult terrain and reduce reliance on locks. The oldest canal tunnel in the world is France's Malpas Tunnel, built in 1679, while the country also hosts the longest, the disused Rove Tunnel. On some English narrow canals, tunnels lacked towpaths, requiring horses to walk over the hill while boats were propelled by legging. Similar structures were built as far afield as the Kingdom of Travancore in 1876, easing passage through challenging landscapes.
Source: Wikipedia
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