When the Weasley wedding is attacked, Harry grabs the first hand that comes to mind - Ginny's. They find Voldemort has hidden his Horcruxes in plain sight out of some of Muggle history's most important artifacts. Now the pair go across the continent, risking capture by both the Muggle and wizarding worlds, to end the war. Post-HBP. AU. It's JKR's world. We just get a sandbox.