The America’s Cup boats are weird. They’re 72′-long catamarans and their masts are 140′ tall. They travel on hydrofoils above the water at ridiculous speeds. But the oddest thing about them is that their sails aren’t made of cloth, but a hard plastic foil. They don’t absorb the wind like a normal boat, but deflect it like an aeroplane’s wings. They’re unforgiving beasts.
Here’s a link to a website that describes them in mini-videos, with fun facts such as “their sails are as tall as a 13-storey building”. It’s takes less than a minute to watch and is worth it.