One day tour Chùa Hương ( Perfume Pagoda), one hours and thirty  from center Hanoi, including luch. 

“Perfume Mount is an ever wish/ With mountains, water, and clouds/ People always ask if this is the top-ranking cavern…” (extracted from “Perfume Mount passion” written by Chu Manh Trinh) 

Around 60 kilometers southwest of Hà Nội, Perfume Pagoda is one among the largest and unique religious sites in Huong Son Commune, My Duc District, old Ha Tay (or enlarged Hanoi), right banks of Day River, northern Việt Nam. It comprises a complex of pagodas and Buddhist shrines built into the limestone cliffs of Perfume Mount (Hương Sơn), scattering alongside the mountain up to the peak. The complex’s center is right inside Huong Tich cavern (or in other words, Inside Pagoda). Huge numbers of pilgrims flock to the site during Perfume Pagoda festival, which begins in the middle of the first lunar month and lasts until the middle of the third one (or from February till March) in order to pray for happiness and prosperity in the coming year. Also, it is a very popular opportunity for young couples to meet and for numerous budding romances to be formed. On this special occasion, a wide range of traditional cultural activities is incorporated. Perfume pagoda is not only a religious site, but a great sight-seeing spot in Vietnam as well. ( sources Vietnam- beauty.com)