A cave is a natural opening in the ground extending beyond the zone of light and large enough to permit the entry of man. Occurring in a wide variety of rock types and caused by widely differing geological processes, caves range in size from single small rooms to interconnecting passages many miles long.
Cuban passport. Cuban passports are issued to citizens of Cuba to facilitate international travel. They are valid for 6 years from the date of issuance, but have to be extended every 2 years. The cost of this passport is about US$500 (CUC 500) for every two years if one person lives in the United States. Until January 14, 2013, the Cuban government required that all Cuban citizens and foreigners such as foreign students that live in Cuba desiring to leave the country would have to obtain an exit permit (Spanish: Permiso de Salida).
Costs for a U.S. passport begin at $135. (Photo: Creatas Images/Creatas/Getty Images ) Passports are a travel essential these days for every American because of the rewriting of travel laws to strengthen border security after 2001. Prior to that, travel to Mexico and Canada did not require a passport. Passport cards offer a cheaper option to the $135-plus cost of a passport book and can be used for land ...