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In page History of Malta:

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Among the most interesting and mysterious remnants of this era are the so-called cart ruts as they can be seen at a place on Malta called Misraħ Għar il-Kbir (informally known as Clapham Junction). These are pairs of parallel channels cut into the surface of the rock, and extending for considerable distances, often in an exactly straight line. Their exact use is unknown. One suggestion is that beasts of burden used to pull carts along, and these channels would guide the carts and prevent the animals from straying. The society that built these structures eventually died out or at any rate disappeared.[citation needed]