I remember someone showing me this website where, you took a link of a photo or uploaded a photo and it told you all the websites that photo is on.

Does anybody know of this website?

It's nothing like Google's image search though.

Tineye.

Tineye.

No, it's not tinyeye.
There was a search bar right on the page in the middle as you entered.
And you didn't have to sign in.

Gazopa, http://www.pixolu.de/ and Google similar image search. Gazopa is down. Pixolu has the search box front and center with no sign in like you mentioned.