Guam serves as a gateway to Micronesia and the Far East.  It also serves as the port of entry for people traveling to the United States from other countries in the area.  As such, passport and visa requirements are necessary.  Visitors from a host of neighboring countries may travel to Guam for business or pleasure for a period not to exceed 15 days, without first obtaining a visa.  This is made possible through the Guam-Only Visa Waiver Program.