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With 32 miles of caves and underground passageways, this national natural landmark is one of the longest caves in America. Besides being a site for tours and exploration, the caves are also the ...
An example of a medieval building with many subterranean passages is Prague Castle. In the Middle Ages underground passages were dug out mainly for purposes of defence. Later drainage conduits transported waste water to the foot of the castle wall and then let it fall freely over the slope of the bare cliff face into the bed of the Brusnice stream.
Secret passages in old buildings, castles, haunted houses, and the lairs of villains or superheroes enable characters to secretly enter or exit the building, access a hidden part of the structure, or enter a supernatural realm. These passageways are often opened by pulling a disguised lever or lock mechanism.
A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length.
Photos show the inside of the well-preserved hidden tunnels. Secret underground passageways discovered in ruins of 4,300-year-old city in China Skip to main content
A tunnel is an underground passageway, dug through the surrounding soil or rock for the purpose of transport, passage or communication. [2] Tunnel construction is a sub-discipline of civil engineering [ 3 ] and usually the domain of engineers and construction companies .
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A tunnel in the west part of the downtown loop. The Houston tunnel system is a network of subterranean, climate-controlled, pedestrian walkways that links 95 full city blocks 20 feet (6 m) below Houston's downtown streets.