9. The Brooklyn Navy Yard Hospital Annex

The Brooklyn Navy Yard Naval Hospital Annex (or the Naval Annex) was built from 1830 to 1836. It was active through the Civil War, supplying almost a third of the medicine distributed to Union soldiers, and both World Wars until it was decommissioned in the 1970s. Some of the first female nurses and medical students were employed there. Dr. E. R. Squibb, the leading pharmaceutics inventor and part-name sake of the pharmaceutics company Bristol-Myers Squibb, developed the first anesthetic ethers for use in surgery.

It’s one of the few original buildings that remain at the Navy Yard. Steiner Studios, a major anchor tenant there, is working on transforming the space into a 420,000-square-foot media campus by 2027.