Activities Building The Activities Building, located up the hill from the swimming pool, is a popular site for family reunions, picnics, and receptions.
Allegheny Observatory The brilliant dome of the Allegheny Observatory atop Observatory Hill is an important focal point for Riverview Park. In the mid-1850s, prominent Pittsburgh businessmen formed the Allegheny Telescope Association and built an observatory on Perrysville Avenue in the City of Allegheny containing what at the time was the world's third largest telescope. In 1867, the observatory was turned over to the University of Pittsburgh to study sunspots. The observatory also was used to tell time by the position of the stars, supplying information for the official clock system of the Pennsylvania Railroad. By 1900, the view of the stars was blocked by Pittsburgh's industrial pollution.
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