Kun Iam Tong, or called Kun Iam Temple, is one of the Three Ancient Temples of Macao, where there are many worshippers. On the gate there are couplets: Sultans come from India and Kun Lam manifest miracles in the south sea.

As a temple of a large scale in construction, Kun Lam Temple also consist of other hall like a Hall of Eulogy, Hall of Tan Yue, Hall of Miao Xiang, Buddhist Dining Hall of Abbot. There are ancient sky-reaching trees growing in the garden of the back mountain, a memorial archway in commemoration of Abbot Monk Dashan and Memorial Pavilion in commemoration of ex-abbot Monk Huiyin.

Kun Iam Temple, situated in the first biggest village Mong Ha in the suburb of Macao, near to the county Xiangshan, was the place where the second unequal treaty Mong Ha Treaty between China and United States of America was assigned in the summer of 1884 after the Opium War by the Imperial Envoy Qiying and Caleb Cushing on behalf of USA. In 1944, one-hundredth anniversary of the signature, a tablet was erected to relate the event in the garden of the back mountain.

In the garden beside the temple, there stands a round stone table on which the first Sino-American Treaty was signed in 1844 by the United States minister Caleb Cushing and Viceroy of Canton, Ki Ying , as one of the many unequal treaties signed between China and the West in modern history.