Define: high level.
Currently sitting around lvl 11, I haven't seen / haven't dare to enter half of the PoTm dungeons., if not more. Even with a good party I had the courage so far to visit the following (mind me, some is already too low level and i am not visiting it):
1. caves along the lake zarovich (2 )
2. fire beetle hive
3. caves along the western svalich road (3)
4. sullen woods (if not ogres or vampires)
5. ML crypt
6. Zeklos crypt
7. southern forest terg ruin
8. southern forest monastery
9. sewers, were-rat hideout
10. under the market district, tunnel system
11. treant grove
12. Village mausoleum
13. [gasps] were-fox grove
14. Dvergheim mines, 1st level
15. hobgoblin tin mines
16. bandit crypts.
hrm.... it's actually not that few,,,but meh, some of these really need a good party. And never dared to solo the mid-lvl dungeons. Not sure, so what you mean under high lvl dunegons and how many are there actually, but pls keep in mind that not everyone can solo dungeons, and those who can will get an extreme advantage over the others. If dungeons would be upgraded, I'd kindly ask to make them more deadly against certain solo-like classes. For instance: some monster that feeds purely on monk-essence?