The Cao Dai Temple is located in Tay Ninh. It also happens to be the center of the religion as the Holy See is located at this place.
This is a wide angle shot of the temple.
Note the unusual architecture on the ceilings. Note also the eye.
It looks rather like the dollar bill eye to me.
Okay, this is where the people were hiding out from the North Vietnamese Army. Be aware that this location is not too far from Saigon. Yes, we are less than a day drive away from the heart of the city. So the scenario is that Phan Phuc sees trouble, and the rest of her family decide to flee. So they head down the road, and then they get napalmed.
As stated in Lonely Planet, Tay Ninh is on Highway 22 which passes through Trang Bang where Kim Phuc got napalmed. This is how it looks today. Of course, it has been several decades.
Another view of the highway.
This is a temple named after Kim Phuc located around where the photograph was taken. Essentially, her picture became the postcard for the Vietnam War.