A place is a room in a building, a cave, a park etc.
Every person in the world has 0,1 or 2 special places.
The number is dynamic, and can change during the day.
For most people, there are usually two, but sometimes one. Rarely zero.
For some people, there can never be two, only zero or one.
What are your 0, 1 or 2 special places?
Note: There's one definition of a special place, and it doesn't contain the word "or" (or similar). This is to say, the definition isn't something like "a special place is either X or Y".
Hint: This is a likely sequence of the number of special places a given person has over time:
0, 1, 2, 1, 2, 1, 2, 1, 2, ..., 1, 2, 1, 2
In the first world, almost everyone is in the first group (with mostly 1, 2 places). In the third world you would see a lot more from the second group.
Strangely enough, there's a group of people that have a very unique sequence of 'number of current special places' and those people are doctors! (not all doctors, but a small subset of them)
Hint 4 (a big one):
If you're in a place (i.e. not outside), it's most likely a special place for you, with rare exceptions.
Hint 5 (also a big one):
The only exception for hint 4 is this: If the place you're in was special for you before you entered it, it will stop being so once you're in it.
To know if a place is a special place for someone, you need to know the history this person has with this place. You don't need to know their history with other places, nor what are their other special places, nor anything about the person's life outside this place.