Interest in visiting Cuba, so close to our border yet so different in its culture, economy, and form of government, is rising. These images confirm it as a world apart, which is why travelers want to see it before it changes. While it's possible to enter Cuba by flying from Canada or Mexico, US citizens who are caught trying to do so are subject to penalties and prosecution. However licensed, US-government-sanctioned educational tours and ones led by religious groups are permitted. If you go, don't expect a cocktails-by-the-pool type of vacation; tours focus on the country's schools, historic sites, and hospitals — and include a healthy dose of propaganda.