During my visit to Stockholm today I also took time to visit the marvelous ship Vasa. It is the most popular attraction in Stockholm with 1.2 mio visitors every year.
Vasa was built top-heavy and had insufficient ballast. Despite an obvious lack of stability in port, it was allowed to set sail and foundered only a few minutes after it first encountered a wind stronger than a breeze.
You can read the story about Vasa here.