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See the stars, or at least a place where they study the stars, at the University of Pittsburgh’s Allegheny Observatory. This national historic landmark has been a vital part of American astronomical research since 1859. Nowadays, the Allegheny Observatory is open to free public tours from April until the end of October.

If you love history, art or science, you will definitely want to visit the Carnegie Museums of Pittsburgh. The Carnegie Institute operates the Carnegie Museums, and two of the four facilities can be found alongside the headquarters. Visit the Carnegie Museum of Art and the Museum of Natural History in the same complex, or travel a bit to see the Carnegie Science Center and the Andy Warhol Museum.