Kesi Irvin's summer side hustle has taken her across the world. The New Jersey native is paid to sample gelato in Italy, jet ski in the Mediterranean and walk through open-air markets in Croatia.

While Lürssen claims a whopping 13 of the 25 largest yachts in the world, Oceanco rules the waves when it comes to sailing vessels. The Dutch shipyard scoops the top two spots on this list, with a ...