Philadelphia City Hall -- still the world's largest and tallest masonary building; the most adorned building in the world; the clock face on the tower is larger than Big Ben's; it stood as the world's tallest building from 1901-1907 and when construction started in 1870 it was conceived as the tallest free standing structure in the world; they once debated demolishing the building however when estimates came out that it would cost over 700 million dollars to demolish (back in 1980) they decided to just leave it alone; in 1995 they started a 10 years reburbishing that is almost complete.
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