If you are looking for a sense of wonder in particular, I'd recommend pretty much anything by Carl Sagan. Audio-books, Cosmos show, etc. My thought is that the social proof will transfer his positive valence to you. Ideally, when thinking about anything on a grand scale, it would trigger an association with that sense of wonder.

I hesitated to say this though, since it is also likely to make a sense of smallness more salient, if it isn't already salient. Use your best judgement.