2. High Bridge
High Bridge narrowly escaped demolition in the 1920s and was recently reopened in 2015. The High Bridge opened in 1872 to provide water access to the rapidly growing population of Washington Heights – and in response to the widespread popularity of the flush toilet. More notably perhaps, the tower is one the historic structures in the city still sites which you can legally climb. High Bridge was reopened as a pedestrian crossway over the Harlem River last year.