This fun map shows you what’s across the ocean if you’re on the beach. For instance, if you’re on the west coast of the U.S., you’re across the ocean from either Japan or Russia, depending on whether you’re north or south of Tillamook Bay, Oregon (essentially Portland). For greater accuracy and interest, it would be nice if the map showed all the island nations, but then of course the map would be a lot busier (and it wouldn’t make much difference for the west coast of the U.S. anyway).
On the east cost of the U.S., going east, you’d basically hit Spain, Portugal, Morocco, or the Western Sahara. Here, the inclusion of islands would make a difference in some cases (e.g. the Azores, Madeira and the Canary Islands). But one interesting bit is a portion of beach (5 or so miles long) immediately south of the Wright Brothers National Memorial at Kill Devil Hills, N.C. — if you go due east from there, you thread the Strait of Gibraltar and get a couple hundred miles into the Mediterranean Sea, to the Algerian port city of Mostaganem.
Note also the bottom of the map. Mostly, when you’re in southern Chile, going due west get you to Argentina, and when you’re in southern Argentina, going due east gets you to Chile. At the very bottom, it’s all Chile, so going due east or due west just gets you to Chile. But right between the mainland and Tierra del Fuego, at the eastern entrance to the Strait of Magellan, Argentina jumps over the strait — also a distance of about five miles — exposing a bit of Chile. So there’s a tiny area of western Chile, just north of Tierra del Fuego, on some small islands between Pacecho Island and Parker Island, where going due west will get you back to Chile, though you’d get to Argentina if you started a bit north or a bit south.
If you like map tools, also check out this antipodes map, which shows you what place is on the other side of the world from you. Most places in the U.S. have ocean on the other side, but for fun, you could check out what places in the U.S. (including territories) would get you to some land.