The diplomat was Zhou Daguan. He first arrived at Angkor in 1296 CE.See:http://en.wikipedia.org/wiki/Zhou_Daguan
The population of Daguan District is 267,000.
Zhou Daguan died in 1346.
Zhou Daguan was born in 1266.
Daguan County's population is 260,000.
The area of Daguan District is 12 square kilometers.
The area of Daguan County is 1,802 square kilometers.
Daguan Zhou has written: 'The customs of Cambodia' -- subject(s): Civilization
The answer to that question is 15 million people per year
The Angkor Wat Temple complex is in Angkor now known as northwestern Cambodia.
For the same reasons that they visit any of the other famous sites of the world: They are interested in them. People visit the Pyramids of Giza because they are interested in them; they visit the Eiffel Tower and the Great Wall of China for the same reasons.
Angkor Wat is in Cambodia.