Far away from HCMC, but was worth the drive, about 2hr. Quite unique, a symbiotic mixture of Christianity, Hinduism, Buddhism, Confucianism, Islam. Arrived around noon, during the prayer service, all people dressed in white and barefoot. You can go on the second floor for nice photos.
We did this in combination with Cu Chi Tunnels, worth the combination for a full day of activities. At night, a marionette show and dinner.