Paterson's history is off-the-charts cool. First industrialized city in the U.S. after harnessing the power of the Great Falls (second largest waterfall in the U.S.) with the planning of founder Alexander Hamilton. Became famous as "Silk City" and has a castle built by one of the first textile magnates in the country (Lambert's Castle). Also was the largest builder of Locomotives, and home to Samuel Colt, who built the first revolvers and manufactured them in Paterson. John Philip Holland built his first prototype submarines in Paterson, and sunk them in the Passaic River.