1.   He boarded in a cramped second-floor room that could only be reached by passing through the room of another guest.

2.   It is surrounded by taller Palestinian buildings and can only be reached by passing through checkpoints controlled by the Palestinian police.

3.   It was just outside the cloistered neighborhood in Forest Hills, reached by passing under an elevated embankment of the Long Island Rail Road along its northern edge.

4.   The pond can only be reached by passing through locked gates, past signs warning of the risks of radiation exposure.