Why does that bother you? There are multiple things Dolores are seeing. The town with the church is a testing area during the beta before the park opened. It is where they first trained the hosts. Something happens there and Arnold dies. Ford literally buries the town along with its secrets and opens the park to the public. Dolores feels drawn back to the place, and William is the one who actually takes her there, but they don't get to finish their journey. She remains trapped in her loop for 30 years until MiB returns to reawaken her. And she starts following Arnold's calling again, retracing her steps, but because she is remembering now, as she journeys through unfamiliar territory her only anchor is the one time she traveled it before - with William. Her memories are triggered by people and places she has encountered before in the past.