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).
How much does a passport cost? Again, it depends on the many variables we have listed above. The lowest possible price would be about $50 for the renewal of a passport card for an adult. This would include the application fee, passport photo and postage. The highest amount an applicant might spend to get a passport can reach $750 or more. That's a pretty high price to pay for a passport and probably only worth the cost in emergency situations.