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In many cities and towns in South America, you can usually ask the '''firemen''' (es:bomberos, pt:bombieros) if they have a place for you to crash for a night. Often they will give you a bunk or , matress or couch to sleep on. Sometimes they give you a place to put up your tent. Sometimes they say no or make excuses. It's worth a try to ask though! They have bathrooms and usually a kitchen where you can cook.