The World is a private luxury residential ship that houses about 165 distinct apartments. The cost of an apartment onboard the ship is supposedly about $1.6 million USD, and they are mostly uniquely decorated. Launched in 2002, the ship boasts of 12 decks and spans across 644 feet.
According to CNN, apartments on The World can only be purchased on an invite-only arrangement. That is, multiple residents have to send potential residents a purchase invite. The report further mentions that a net worth benchmark of $10 million USD is required for residents.
The ship plans its travels about 2 years in advance, and visits spotlight events like Wimbledon in London etc. Residents also have the freedom of exploring various locations alone, and rejoining the trip at their convenience.