4. Al Saïd

In case you didn’t notice, she has a helipad. And what you can’t see? Accommodations for 65 guests (plus a reported crew of 150), a movie theater and a concert hall for when your favorite orchestra swings by for a visit. Number 4 on the list of world’s largest luxury yachts is Al Saïd, yet another build by Lürssen. Al Saïd measures 508 feet 6 inches and was launched in 2008.