2. Delphine. While no longer in business, Great Lakes Engineering Works, near the city of Detroit, delivered this grand old lady, then powered by steam, in 1921. The original owner was Horace Dodge (yes, that Dodge… the head of the same-named automobile company). Measuring 258 feet (78.6 meters), Delphine was the largest yacht in terms of tonnage at the time. A crew of 55 tended to 20 guests. These days, Delphine entertains charter guests in the Med with a decor that looks like it stepped straight out of the past, thanks to a refit that took place from 1998 to 2003. She also is fitted with traditional diesel propulsion, though interesting enough, the owner has explored the option of repowering her with diesel-electric propulsion. He also has her for sale for €38 million ($51.6 million). more