Signs are obviously everywhere. In Europe, there is a critical category of sign -- those which identify the nearest toilet, or the loo. (The origination of the term "loo" is quite an entire different and interesting discussion. Really.) And the public latrines are often not equiped to our standards; and often one must pay to use or buy sheets of toilet paper. If such paper is even available.
We do tend to take for granted the availability of rest room facilities in this country. Outside the US, a constant awareness of the nearest available water closet, and its state of cleanliness, can be crucial. Given the sudden change in diet and exposure to new strains of bacteria, which often accompanies foreign travel, such knowledge can save the intrepid traveler from quite the predicament.
Trust me, I know.