Built in the 19th century, Sweden's blue ribbon stretches for 190 km and links several rivers and lakes on the way from Gothenburg to Soderkoping. It has been used both for transporting cargo and cruises. However, mostly it is used for pleasure cruises. Ironically, it is often called the "divorce ditch" due to all the poor couples desperately trying to navigate around other boats full of couples. Sounds fun, doesn't it?