books and maps

What if you could travel along the time-space continuum (something like that) and visit a planet stuck in another time dimension? Say, Tudor England, with King Henry VIII on the throne? On a distant moon: ancient Rome or Renaissance Italy. Of course, you would have to be careful where you end up and you'd want to stay clear of the action, but it would be a heck of a vacation. If this is already a novel please do tell me the title. I recently had a fantastically frightening dream about a...