Congratulations to my brother and niece for climbing Mount Fuji in late August.
The summit of Mount Fuji is 12388 feet above sea level. I believe this is a bit higher than I have ever been on land. I think the highest I have been is on Trail Ridge Road in Colorado which has a maximum elevation of 12183 feet. It is possible to drive to the top of Pikes Peak (14115 feet) but I haven't.