The Chronoliths by Robert Charles Wilson
This is a pretty cool sci-fi novel set in the 2020s. An American expatriate 20-something slacker in Thailand goes with a fellow expat to check out this monolith that appeared out of nowhere. This Chronolith, as it comes to be called, is a huge structure that is built of material and with technology that seems to be unheard of. It is a monument to a great military victory---20 years in the future. A few years later, another one pops up in the middle of Bankok, wiping it out. Over the years, Scott Warden, a computer programmer, is recruited by a former physics professor to help get to the bottom of things.
I'm still in the middle of this one, but it's an excellent read. It's a different type of time travel story, and it takes a look at some astonishing new evidence that changes the way physicists think of cause and effect. I highly recommend it.
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