Italy, Lazio, Rome, Tivoli, Villa Gregoriana, Miollis Tunnels.
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Mexico, Puebla, Narrow, exploratory tunnels within the pyramid of Cholula.
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Switzerland, Bern, Gadmertal, View west along Upper Gadmertal showing third tunnels on road to Susten Pass. Gadmenflue clifftops against skyline.
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Turkey, Cappadocia, Uchisar Castle is a huge volcanic rock outcrop riddled with tunnels and dovecoate windows.
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Turkey, Cappadocia, Uchisar Castle is a huge volcanic rock outcrop riddled with tunnels and dovecoate windows.
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Los Hervideros or Boiling Waters from viewpoint on south west coast road. The sea crashes through lava formed tunnels sea eroded chimneys and arches as if boiling. volcanic Espainia Espana Espanha E...
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Car on high Gardesana Occidentale road with tunnels through cliff beside Lake Garda near Limone.
