Four royal honeymoons took place on board , including Prince Charles and Princess Diana 's 16-day trip in the Mediterranean . Magisterial mega-yachts have ferried royals around the world . `` Her Majesty 's Yacht Britannia '' is one of the most splendid examples . It was built in 1997 and has a length of over 100 meters ( about 330 feet ) with an overall beam of more than 30 meters.
Magisterial mega-yachts have ferried royals around the world . `` Her Majesty 's Yacht Britannia '' is one of the most splendid examples . It was built in 1997 and has a length of over 100 meters ( about 330 feet ) with an overall beam of more than 30 meters.