On 27 April, a special event is coming, when Budapest's passenger boats will welcome visitors and set sail – for free.

The deadly accident comes five years after at least 27 people were killed in Budapest when a river cruise boat collided with a smaller tourist vessel, sinking it in seconds. The tourist boat ...

I'm aboard the Viking Tor on a river cruise between Budapest, Hungary and Passau ... and icy castles from the boat's top deck. It is a special time of year to navigate the Danube.