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Ancient drainage systems in UK, Australia and Canada
Source:Globaltimes.cn Published: 2012-7-23 19:22:33
Australian underground drainage tunnel which is called “cave” by people who are interested in urban exploration Photo: Xinhua
Australian underground drainage tunnel which is called “cave” by people who are interested in urban exploration Photo: Xinhua
Niagara Falls tailrace tunnels in Canada Photo: Xinhua
A stunning parabolic arched draining tunnel in Sheffield, UK Photo: Xinhua
Posted in: World