As the title says, you can summoner teleport to the store-bought Vision Wards and to Teemo's mushrooms.

I think this is a bug since Teleport has more than enough uses already. It shouldn't be providing extra mobility to anywhere on the map. I've also heard that this may have been addressed in a previous patch, but if so the change was reverted.

Step 1: Choose the summoner teleport spell when beginning a game.
Step 2: Buy a vision ward from the store.
Step 3: Teleport to it.