Time Travel Evidence?

Is there any evidence for time travel. Debunkers often ask for photos of the future. Photographic evidence of time travel would be a great thing, but what exactly would constitute proof. If I show you a photo of a building before it is built you might claim that I am friends with the builder.

The question is what is undeniable evidence. A newspaper headline is often quoted by debunkers as evidence, but if I brought the front page of the Wall Street Journal from the future, I would be accused of creating it in Photoshop and being friends with the editor that told me what stories he would write.