Some destinations just stand out above the rest. Many are the type of places where you can take a photo, and it requires no explanation to identify the location: the Eiffel Tower or the Colosseum. But some places are less well known to new travelers or those who have not yet ventured out to the more exotic destinations. These can often be the most rewarding to visit.
For many of these attractions, it's what they symbolize and the destinations they represent that make them so significant. In other cases, it is the site itself that makes it worth visiting the country. Some of these are the more popular UNESCO World Heritage sites.