The Superyacht Show at Palm Harbor Marina will host a raft of massive vessels, including the largest, which is nearly 280 feet long.

$350 million: Russian billionaire Andrey Melnichenko owns Motor Yacht A, which has 8 decks and a helipad. $400 million: Sheikh Mohammed bin Rashid Al Maktoum, the Vice President and Prime Minister ...

The longest yacht — but not the most expensive — is Bold, which is 279 feet and 10 inches long and features its own helipad. The Palm Beach International Boat Show is March 19-23 on the West ...