In 1904, Orchestra Hall was designed by Chicago architect Daniel Burnham. The building has "Theodore Thomas Orchestra Hall" inscribed in the limestone in the front of the building because he was the man who started the Chicago Symphony Orchestra. The names Bach, Mozart, Beethoven, Schubert, and Wagner are also inscribed above the second floor windows. In June 1993 they began to renovate and expand Orchestra Hall. The total cost of the renovation and expansion were $110 million Orchestra Hall was designated a National Historic Landmark.
How limestone forms: Limestone consists mainly of calcium carbonate (CaCO3) and forms on the bed of the sea from the remains of sea shells and other marine organisms. Remains of fish, shellfish, and coral. Their remains settle on the bottom of the ocean where they are again buried by more remains. Heat and pressure causes these animal remains to form limestone. The remains of shells and other fossils can often be seen in limestone. Due to the way limestone is formed, it is classified as a sedimentary rock.
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