Composition
Most (95-97%) of the catacombs are former sandstone multilevel mines, from which stone was extracted to construct the city above. The remaining catacombs (3-5%) are either natural cavities, or were excavated for other purposes such as sewerage. As of 2012, there are more than 1000 known entrances to the tunnels.
Read more about this topic: Odessa Catacombs
Famous quotes containing the word composition:
“Those Dutchmen had hardly any imagination or fantasy, but their good taste and their scientific knowledge of composition were enormous.”
—Vincent Van Gogh (1853–1890)
“The composition of a tragedy requires testicles.”
—Voltaire [François Marie Arouet] (1694–1778)
“At painful times, when composition is impossible and reading is not enough, grammars and dictionaries are excellent for distraction.”
—Elizabeth Barrett Browning (1806–1861)