Some countries aren't built to last. For this list, we’ll be looking at past countries, unions, and empires that have fallen or dissolved.

There are actually quite a few countries that disappeared in the 20th century – and many of these are countries that disappeared because of war. Germany used to be called Prussia, East Germany and the Weimar Republic, Sri Lanka was once Ceylon, Czechoslovakia is now the Czech Republic and Slovakia, and the Ottoman Empire was basically replaced by the Republic of Turkey. WatchMojo counts down a list of nations that don’t exist anymore.

This war included the longest siege in modern times. http://www.WatchMojo.com looks back at the events that led to the Bosnian War, as well as some of the key dates and events that occurred during this conflict.

This South-Eastern European country is known as the heart-shaped land. http://www.WatchMojo.com continues our travel series with a look at Bosnia-Herzegovina.