It's a place you need to see in person at least once in a lifetime.
It's a sight you should see in person at least once in your life.
at least once = 一度は、最低一回は
これに付け足せるのが
in a lifetime / in your life = 人生で
Once in a lifetime, once in your life = 人生で一度
美しい場所＝ a beautiful place
景色＝sight / view
場所によりますが上記の単語が使えます。
生で = in person, in real life
どうぞご参考までに。
日本 
