Tourism is 관광, reading KwanKwang, in Korean. It means “viewing light.” So pilgrimage is to travel to view light which is not ordinary light but the Holy Light. Most religious textbooks have descriptions of the Holy Light emitted from Messiah, Maitreya, JeungDoRyung, etc.
Why did those religious textbooks mention the Holy Light? Because the Light is the symbol or identifier, saying, “This is Messiah, Maitreya, JeungDoRyung who you are looking for. So you must listen to his words positively.”