Innnnteresting...

[stickmaker]

The mountain in Tycho Crater on the Moon may not be a simple rebound peak, as long thought:

http://www.universetoday.com/94583/scientists-suggest-evidence-of-recent-lunar-volcanism/#more-94583l

Better view of the mountain:

http://www.nasa.gov/mission_pages/LRO/multimedia/tycho-peak-gal.html

Any vulcanism is still speculation, of course. Even if there is outgassing, the peak could be pure rebound and the gasses moving up through cracks unrelated to volcanic activity. However, that "boulder" in the summit crater does resemble a lava dome:

http://www.nasa.gov/images/content/565703main_verticalv_boulder.jpg