Here's an inevitable but different take on the time travel story. It answers the question of where you would find other time travelers and what you would do when you found them. The place to find time travelers is apparently at Jesus' crucifixion. And what you do when you find them is to form a league of time travelers who can hopefully make the future a better place. Never have I seen any other time travel author touch on these ideas, but they do seem like obvious ideas.
This story was quite enjoyable and only took a couple of sittings to finish. The time travelers in this story have a genetic predisposition to time travel with their physical body instead of by using a time machine. Their period of time travel covers quite a large period of time from the crucifixion to ancient Rome to pre-Colombian America to 1970s America to the day of judgment and beyond. It covers themes of love and deception and also tries to answer the question of what the ultimate possibility could be for a time traveler.
I definitely think this time travel novel is a sadly overlooked one that should have become more famous than it did. Poul Anderson wrote several other novels with time travel themes that I'd like to delve into soon.