National Geographic Travelのインスタグラム(natgeotravel) - 10月17日 19時34分

Photo by @shonephoto (Robbie Shone) // What amazing tunnel systems lie beneath our cities? Dubbed 'Megatron' by the secretive network of urban explorers who sometimes delve into its silent chambers, this storm drain lies directly under Sheffield (England) city centre. So concerned were our Victorian forebears with the possibility of the city flooding that they decided to build this giant underground wonder in 1860. With a parabolic brick arch this feat of engineering prowess protects the city from potential flooding by rain.

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