Jules Verne’s 1895 novel Propeller Island imagines an immense ship in the Pacific Ocean that’s inhabited entirely by millionaires. In 1999 an organization calling itself Freedom Ship International proposed the real thing, a ship four times as long as the Queen Mary and 25 stories tall. Altogether the ship would boast 18,000 living units, 3,000 commercial units, 2,400 time-share units and 10,000 hotel units, and like Verne’s ship it would circle the world continuously.

“The proposed vessel’s superstructure, rising twenty-five stories above its broad main deck, would house residential space, a library, schools, and a first-class hospital in addition to retail and wholesale shops, banks, hotels, restaurants, entertainment facilities, casinos, offices, warehouses, and light manufacturing and assembly enterprises.”

Cost estimates started at $6 billion but soon nearly doubled, and construction still hasn’t begun, though the company was actively pursuing its plans as recently as November 2013. While you’re waiting, you can stay on this giant yacht.