The ocean floor is home to centuries’ worth of sunken vessels integrated into marine habitats. Explore extraordinary wrecks around the world and learn how these artificial structures have become a part of the ecosystem–and in some cases, a vital tool in reversing the effects of human impact.

Part 2: Florida Keys: Shipwreck Trail
The waters off the Florida Keys are home to a time capsule: the famed and eerie Shipwreck Trail. From World War II freighters to 19th-century steamships, these relics of a bygone era are preserved in their watery graves, home to an exotic array of marine life.