130 km far from Hanoi, built at the beginning of the 17th century on an open natural ground Keo Pagoda may be the largest in Vietnam. There are in all 16 structures, big and small, in the premise. Specially, the bell tower of the pagoda may be regarded as a masterpiece of wood joining. Although only 11.06 metres high, it is quite impressive due to the richness of its architectural traits.