Issue 1 of House of X gave us a map of Krakoa (Pacific) and 12 points on it:

1. House of X
2. House of M
3. Arbor Magna
4. Arena
5. Akademos Habitat
6. Transit
7. The Oracle
8. The Grove
9. The Cradle
10. The Reservoir
11. The Wild Hunt
12. Carousel

All a complete mystery. House of X issue 6 has now expanded even further on this, with a new Atlantic region, 9 more places of interest and expansion on some of the previous locations:

13. Bar Sinister
14. Hellfire Bay
15. The Red Keep
16. Blackstone
17. The White Palace
18. -------------------------------
19. Transit [Atlantic/Pacific]
20. The Pointe
21 Danger Island [Training]

Arbor Magna (3) is now revealed as Resurrection and Tranist (6) is revealed as the main one.

Let's speculate on each location and what is there!
15-17 seem to be the colours of the hellfire club and are located right on Hellfire Bay.