The Pangai Free Wesleyan Church, also known as the "King Taufa’ahau Tupou I Memorial Church," offers visitors a unique opportunity to immerse themselves in a traditional Tongan church service in Ha'apai. One notable highlight of this church is the "Mystery Cross," an intriguing relic with a fascinating history. According to a sign at the cross, it mysteriously appeared on the ground in 1975, adding to the church's mystique and allure.