天壇 is [Tian Tan] or [The Temple of Heaven] ?

The Temple of Heaven is certainly better because it conveys the messaeg clearly to people who do not know Chinese. Moreover, this historical site has become well known in the English speaking world. Everyone knows what you are talking about.

"then temple of heaven" 係正確答案... 之前去beijing, d 簡介係0甘寫

[Tian Tan] 係好D嫁!因為人地天壇個名係咁呀嗎!

其實兩個都可以. 如果作文, 用後者便可多些字了, haha....