The cornerstone was laid on July 4, 1848 but construction was halted due to a lack of funds and the intervention of the Civil War. The obelisk's capstone was set on December 6, 1884. The structure was officially opened on October 9, 1888. What is it?

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1. The cornerstone was laid on July 4, 1848 but construction was halted due to a lack of funds and the intervention of the Civil War. The obelisk's capstone was set on December 6, 1884. The structure was officially opened on October 9, 1888. What is it?