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"Originally built as a fort to prevent a British invasion in 1812, this sandstone structure in Battery Park later served as an opera house, theater, immigration center, and aquarium, and today Castle Clinton is a popular attraction for history buffs that is accessible by foot or bike only and houses the ticket office for the Statue of Liberty." - Lauren Dana Ellman Lauren Dana Ellman Lauren Dana Ellman is a New York-based writer and editor who specializes in travel, lifestyle, food, and shopping content. Travel + Leisure Editorial Guidelines