Chicago (Zbigniew Bzdak / July 1, 2011)

1866: Cook County Hospital opens.

1866: City completes two-mile tunnel into lake to draw "pure water."

1867: St. Stanislaus Kostka parish is first of many to serve the Polish community.

1868: Lincoln Park Zoo welcomes its first animals, a pair of swans.

1869: Chicago Water Tower erected.

1870: St. Ignatius University opens (later renamed Loyola).

1871: Great Chicago Fire kills at least 300 people and destroys a huge swath of the city.

1872: First African-American police officer hired.

1873: Tribune reports new city directory shows Chicago has 212 churches, 80 newspapers and 31 railroad companies.

1874: Little Chicago Fire destroys 60 acres on Near South Side.

1875: Tribune reports money available to complete long-awaited "drive along the Lake shore on the North Side."

1875: Edgar Rice Burroughs, author of Tarzan and John Carter novels, is born in Chicago.

1876: The team that would eventually be called the Chicago Cubs wins the National League's first title.

1877: Pacific Garden Mission begins offering refuge to the downtrodden.

1878: Fire pole invented in a Chicago firehouse.

1879: Union League Club of Chicago organized.

1880: Rabbi Emil Hirsch takes over Chicago Sinai Congregation and builds it into city's largest.

1880: Archdiocese of Chicago is established.

1881: Town of Pullman opens to house railroad car factory workers.

1882: Cable car system clangs into operation; it would grow into one of the world's largest.