[Arthalion]

Neanderthals would not be any different looking than anybody else.

They could pass for human easily enough, but they would certainly appear as a distinct ethnic group. You're NOT going to lose one in a crowd of Europeans. They could probably blend in fairly well in a modern multiracial city though.

[RightWhale]

Sweden, okay. Hamburg, okay. London, okay. Madrid, okay. Some other places they might get lost in the crowd.