Some bridges between buildings. Above, on 24th St. between Madison and Park Ave. South.
Below left, in the middle of the Manhattan Detention Complex, aka The Tombs, on Centre St. downtown. Below right, above 15th St. near 10th Ave.
And below, my favorite, formerly bridging parts of Gimbels flagship store, above 32nd St. between 6th & 7th Aves. near Penn Station.