First town Danube flows through is Tuttlingen, in Germany. The town is build around Honberg mountain were a ruined fort , build in Miidle Ages, still stands.
Danube flows through a very pretty medieval citty of Regensburg. What one can say from photos - it is very pictoresque. Large medioeval centre of the cityy is UNESCO heritage site.
The Stone Bridge in photo was build in 1135-1146. The knights of the 2nd and 3rd crusade used it to cross the Danube on their way to the Holy Land.
Regensburg has many sigts to offer - chatedral, many gothic churches and also historical buildings like Golden Cross Inn where Charles V made the acquaintance of Barbara Blomberg, the mother of Don John of Austria (born 1547). The house is also the place where Kepler died in 1630.
Near Regensburg a must see are two classical buidings, erected by Ludwig I of Bavaria. Walhalla is a reproduction of Partenon build as a Teutonic temple of fame on the hill rising from Danube. Second is the Befreiungshalle at Kelheim, 30 km above Regensburg, a large circular building which has for its aim the glorification of the heroes of the 1813 War of Liberation.
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One of the most romantic rivers on the world, in my oppinion. Cruise down the Danube for sure would be wonderful.

Danube is a second longest river in the world. It flows through 10 countries: Germany, Austia, Hungary, Serbia, Slovakia, Bulgaria, Croatia, Romania, Moldova, Ukraine. On the rivers banks are located 4 european capital cities: Vienna, Bratislava, Budapest and Belgrade. Danube's delta has been UNESCO World Heritage Site since 1991.

Danube starts in the Black Forest (Germany) from the two smaller rivers: Brigach and Breg. And it flows into Black Sea in Romania and Ukraine.
To be continued...
Ha Long Bay is a beautiful bay with a number of small islands in Vietnam. It is a UNESCO world heritage site.

Local legends tell that long long time ago the gods send dragon family to help defending land from chinese invadors. Dragons were spitting jewels and jade forming the wall of islands to protect the land. So people could defend their land and later it become Vietnam. Dragons decided to live on earth and place where mother dragon flew down was calle Ha Long.
The bay consists of dense cluster of 1969 limestone islands covered with thick jungle vegetation. Most of them are inhabited and unaffected by human presence. The islands feature endless numbers of beaches, grottoes, and caves.

Ha Long Bay is perhaps the most popular tourist attraction in the country.
Visit
Halong Bay official site for mor information and photos.