What is the highest you have been? height-wise

[Oil]

~12k ft - Rocky Mountain National Park

 

[JTsyo]

~3000ft in NM

 

[dainthomas]

11K feet or so on some pass in CO on the way to Leadville. Also the top of Rendezvous Mountain at Jackson Hole, but I think that's a little lower. Next trip to Hawaii, I'm going up Mauna Kea, so that'll smash those other two.

 

[nageov3t]

man-made: 1,368' (top of the World Trade Center)
natural: 6,288' (Mount Washington, NH)

 

[lord_emperor]

Local mountain peak, 1,981 m (6,499 ft), but really only a 500m gain from the base.