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1tunnels 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 …
2Razor — For other uses, see Razor (disambiguation). Razor A Gillette Mach 3 razor …
3Tomb of the Unknowns — The Tomb of the Unknowns (also known as the Tomb of the Unknown Soldier, although it has never been officially named) is a monument dedicated to American servicemen who have died without their remains being identified. It is located in Arlington… …
