"Ghost ships" are vessels that are found adrift at sea without any crew on board. These ships can be abandoned due to various reasons, such as shipwrecks, piracy, or financial issues. They often raise curiosity and concern, as they can pose hazards to navigation and marine life. Some ghost ships have fascinating histories, like the Mary Celeste, which was discovered in 1872 with no one aboard. Others may be remnants of past conflicts or disasters. While some ghost ships are eventually salvaged, many remain lost to the ocean, becoming part of maritime lore and mystery.