'Doc' Holiday Gravesite (Glenwood Springs, Colorado, USA)
If you have seen the movie Tombstone then you likely know who Doc Holiday was. For those who have not, basically, he's a badass American cowboy, gambler, and gunslinger. I visited his gravesite and dragged my kids along to pay our respects. His grave sits on top of a mountain so there's a small hike to get there.
While he does have a tombstone here it is not known exactly where his body was buried. At the time they used wooden markers that long deteriorated and over time his location became unknown.
Location:
N 39° 32.373 W 107° 19.233