The documents that are required in order to travel to Spain may depend on the country of origin of the visitor. For citizens of the European Union, Switzerland, Norway, Iceland and Liechtenstein, the requirement is to hold a valid passport or ID. However, if the tourist is a citizen of another country, it may be necessary for them to also hold a visa or permit. In any case, you are recommended to contact the relevant Embassy or Consulate in order to obtain detailed and precise information on the required documents. The National Police is the authority responsible for the control of incoming and outgoing people into and out of the country.