They were the notorious slave ships ferrying Africans from their homeland into bondage on U.S. shores.
The Middle Passage, or the route the slave ships took, brought more than 10 million people to America who would become slaves. Two million more died in the ocean crossing.
The Middle Passage Project is now working to place historic markers around the Florida coast, at ports where the slave ships docked. Future sites of remembrance include Amelia Island and St. Augustine.