Bran notices the same thing as Chris, that Tannen's uncharacteristic forgetfulness seems to indicate its his memories of Honer's that are gone not your memories of it that have been implanted.  Sure, the physical building is gone but at least you haven't imagined it all.<br/><br/>In fact, as you're thinking on this, it occurs to you you have proof.  The key in your pocket, the one to your father's office to pick up his pen drive.  It's still there and as you look at it you can see its even the same familiar keyring.  A promotional one for Honer's giving its contact number, website, address and all the rest.<br/><br/>Physical proof the place did exist.