Wat Nong Bua (off Chanyangkun Rd, past the BKS station) is a highly unusual large white angular chedi, said to be a copy of the Mahabodhi stupa in Bodh Gaya, India. Quite stunning in appearance, but the decorations seem rather modern and with reason - the structure was built only in 1957 to commemorate the 2500th anniversary of Buddha's death.