Recently discovered this one; it's a Harry/Bellatrix involving time travel back to the Marauders' era:
http://www.fanfiction.net/s/8378840/32/Passageways (Harry Potter)
http://www.fanfiction.net/s/8378840/32/Passageways (Harry Potter)
Canadian lighthouse to U.S. Warship approaching it: "This is a lighthouse. Your call!"