Scenario: You are given two small electronic objects, each the size of a watch or less. These are both two way teleporters. You can place both of these anywhere in the world. Once placed, you (and anybody who knows about these) can use them to teleport back and forth at will. The problem is if you place them somewhere too obvious, somebody could move one of them. The only way to find it would be to go to the other one and teleport through it. If both are lost, well, you're out of luck. They can be moved at any time. Where would you place them and why? Remember, anywhere in the world is allowed.