Situated on a hill in Tiên Lữ village in Hoài Đức District of Hà Tây province, Trăm Gian Pagoda is believed to have been built in 1185 during the reign of King Lý Cao Tông (1176-1210), though it has undergone significant changes since that time. The main temple dates from the Trần era (14th century) and was rebuilt in the 17th century. Below it is a two-storey bell tower with elegantly corner-curved roofs, supporting columns and panels carved with intricate designs and a 1.4-metre tall bronze bell cast in 1794.