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tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
Dam — This article is about structures for water impoundment. For other uses, see Dam (disambiguation). Hoover Dam, a concrete arch gravity dam in Black Canyon of the Colorado River. Lake Mead in the background is impounded by the dam … Wikipedia
King John's Palace — viewed from the south east King John s Palace, King s Clipstone is the remains of a once magnificent medieval royal palace in north west Nottinghamshire. The name King John s Palace has been used since the 18th century, prior to that the site was … Wikipedia

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