text: Allegheny Observatory The original Allegheny Observatory was built in 1859 near Perrysville Avenue, by prominent Allegheny citizens who formed the Allegheny Telescope Association. The association donated the observatory to the Western University of Pennsylvania (now the University of Pittsburgh) in 1867, after which it was used for astrophysical, solar, and planetary studies. The observatory maintained a successful subscription time service to railroads via telegraph for many years. A new Allegheny Observatory was built between 1900 and 1912 in today's Riverview Park. It is owned and operated by the University of Pittsburgh for education, astronomical research, and public lectures and tours.
  Notable people
  Dwight Edward Aultman (1872-1929), born in Allegheny City. Brigadier General, Veteran of Spanish American War, WW1, Commander of Camp Knox and Fort Sill
  Nellie Bly (1864-1922), American journalist, industrialist, inventor, and charity worker
  John A. Brashear (1840–1920), scientific instrument engineer
  Andrew Carnegie (1835–1919), Scottish native immigrated to Allegheny City at age 13, steel industrialist and philanthropist
  Alexander Cassatt (1839–1906), born in Allegheny City on December 8, 1839, executive of Pennsylvania Railroad and brother of artist Mary Cassatt (next entry)
  Mary Cassatt (1844–1926), born in Allegheny City on May 22, 1844, American impressionist painter and printmaker
  Willa Cather (1873–1947), American novelist, taught English at Allegheny High School from 1903 to 1906
  David L. Clark (1864–1939), founder of Allegheny City candy manufacturer D. L. Clark Company, maker of the Clark Bar