Dany goes to see Pyat Pree and the House of the Undying Ones. The whole place seems dodgy as hell, Dany has to go in alone and it is said that people go in and never go out. All her friends tell her it's a really bad idea. So, obviously, in she goes.
She has to keep turning right, which is impossible. But she does it anyway. The House of the Undying Ones is like the inside of the Tardis. Doors open and weird things happen inside that are presumably symbolic of something or other, but I can never work stuff like that out. I'm pretty sure the guy with the wolf's head represents some Stark or other, but that's about it.
Eventually Dany gets to chat with the Undying Ones themselves, fat lot of good that they are. They whisper in riddles, show her more visions and try to attack her. She escapes, only to be attacked with a knife by Pyat Pree who gets whipped by Jhogo.
Probably if you Google it you'll find thousands of theories about what the stuff in this chapter meant, but I'll wait until I've finished all the books before doing that, because spoilers.