N5
あれ
That (over there)
あれは、病院です。
That over there is a hospital.
Explanation
「あれ」 means 'that (one) over there': something far from both the speaker and the listener. It also points to something you both know and remember: 「あれは面白かったね」 (That was fun, wasn't it). On its own, 「あれ?」 means 'Huh?', when you notice something odd.
Mixed up with
これ: close to me.
それ: close to you.
あれ: far from both of us, or known to both of us.
Before a noun, これ / それ / あれ become この / その / あの.