txoilgas: saopaulo1: I started a group, but it's been hard to define them. I've also been worried about how widespread they are and do other countries have them.
Since you are in California have you thought of changing the one you started to cover just the California Historical Sites like other states have with their markers?
The California Historical Landmarks are one thing. In California our state parks system has state historical parks and state historical sites. Sometimes the only place to put them is in the Wikipedia category.
It just became a hassle because some states don't have historical sites on the state level.