Translation:If you come to Beijing, you must go to The Forbidden City.
There is only one that is part of a noun now: "If you come to Beijing, you must go to The Forbidden City."
To be fair, capitalisation of said noun shouldn't be so strictly enforced in light of Duolingo's leniency in other examples.
"if you come to beijing, you definitely should go to the forbidden city" was rejected but I think it's fine
There should only be one "the" before "Forbidden City." It should accept "you must go to The Forbidden City" or "you must go to the Forbidden City."
haha, I was being lazy and didn't capitalise anything, so it rejected "if you come to beijing you must go to the forbidden city", but only for not capitalising "The"
I don't think capitalizing "the" is necessary. And I thought Duolingo doesn't care about capitalization in the answer anyways?