Checking a position for a collision

I've been making a script that places road tiles but they keep overlapping i was wondering if there was a way to check the next location to see if there is something there and if there is i would like it stop but i cant seem to find anything, is there a function like "CollisionPoint" or something where i can just pass in a vector3 position for it to check, any help would be appreciated. Thanks

 

Physics.CheckSphere/Cube, that's probably the closest you can get