Ruskeala marble canyon is a tourist complex, located in the Republic of Karelia in Russia. It is truly one of the greatest natural attractions in the world. The first quarries appeared in this area in 18th century, during the reign of Russian Empress Catherine II. A significant part of the quarry has been excavated by hand. The quarry extends from north to south for about 460 meters, its average width is 100 meters and some parts have a depth of 50 meters.
Marble that had been mined in Ruskeala was used as a finish in most magnificent cathedrals and palaces. The floor in the Kazan Cathedral is covered with rare and increadibly beautiful marble, sills in the Hermitage are also made of the material, as well as some halls of St. Petersburg metro have beautiful marble finish. The canyon is flooded nowadays, and the surrounding area is declared a nature reserve.
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