Today it is a major tourist attraction and has over the years played an important role in the history of Europe. It passes through four capital cites as well as a number of other influential, historic and beautiful towns and stunning landscapes.
There are a few cruise ships that travel from the Rhine via the Main River and the Rhine–Main–Danube Canal to the Danube, making it possible to travel from the North Sea to the Black Sea.
- The Danube Cycleway runs the whole length, the German and Austrian sections being very popular.
- Donausteig from Passau to Grein (between Linz and Melk).
- Sultans Trail from Vienna to Smederevo (between Belgrade and Požarevac)
There are many cruise liners along the river, some just short sections other, such as Avalon, Uniworld and Viking going from Passau to the Delta. Nearly all of the river is navigable, but cruises normally begin no further west than Passau, because the water is often too high for the boats to pass safely under some bridges, especially during the flood-prone spring season. During the dry summer months, the water may be too low, which commonly results in intinerary changes such as the need to change boats or riding a bus between two ports.
- Iron Gates Natural Park
- Srebarna Nature Reserve
- The Danube Delta in Romania is a UNESCO World Heritage Site.