How Did They Find Australia?

A co-worker is shopping for an Avenging Unicorn to give to a loved one. Everyone needs a unicorn, I swear.

Out having a cigarette this morning, and an elderly tourist looking couple with some kind of European accents needed help. They asked where a particular building was. So I walked a couple of meters and pointed up - because it is a very tall building near mine.

Then the lady asked how to get inside. (Noticable pause in conversation.) I said that I hadn't done it myself - but they should probably cross over the road and go through the door.

The lady seemed... miffed? But the guy thanked me very politely.