Regensburg is one of the largest cities in Bavaria. It is located in a strategic position where three major rivers join. This helped the settlement flourish in the Middle Ages.
Regensburg is another of Bavaria's historic cities protected by the UNESCO World Heritage listing.
The medieval architecture in the heart of Regensburg is considered to be the best-preserved city centre from the Middle Ages on the northern side of the Alps.
In those days it was a centre for culture and also for trade on the River Danube which runs through the centre of the city.
Munich Airport is far and away the most-used airport for those visiting the city. The distance is not too great and public transport is readily available.
Distance to Munich Airport: 104km
Distance to Nuremberg Airport: 110km
Distance to Memmingen Airport: 231km
Nuremberg suffers from a much more restricted choice of flights and, while Allgäu Airport near Memmingen is becoming more popular, it is still appreciably further away with more complicated transport than Munich.
Regensburg's train station is situated to the south of the old part of the city and has excellent Intercity connections to major population centres in other parts of Germany as well as a regular service to Vienna via Passau and a frequent connection to Prague.
Regensburg is an extremely popular tourist destination - listed by the country's official travel website as being in the top 20 favourite locations - and as such has a good choice of hotels and other types of accommodation.
Many visitors will want to stay in the old town where many of the sights are located, but there are also quieter locations on the other side of the Danube river or business hotels serving conference centres which may be just as convenient for a stay.
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The answer is obviously the medieval centre of Regensburg, as this is what inspired the protection of the UNESCO World Heritage listing.
The Cathedral of St. Peter is an important example of Gothic architecture in Bavaria and the only Gothic cathedral in the region. Notable features include the stained-glass windows from the 13th and 14th centuries, a Gothic cloister from the 15th century, and the All Saints' Chapel, which can be visited with a guided tour.
The Stone Bridge is the second most important landmark in Regensburg after the cathedral, and it was one of the reasons for the city's inclusion in the UNESCO World Heritage List. Completed in 1146, the bridge enabled medieval trade and customs duties and helped the development of Stadtamhof, the area on the other side of the Danube.
And just so that your visit is not just restricted to history and culture, take the time to sample the local Regensburg sausages!
Like so many towns steeped in history, Regensburg was originally built on an important strategic site.
Settlers had lived here since prehistoric times, but it was the Romans who saw the importance of the Danube river and the places where it could be crossed.
The Danube itself was a trade artery from east to west, while the ford here at the northernmost point of the river meant that traders travelling into their territory would be funneled through the settlement.
Regensburg was known by the Romans as Castra Regina. They had originally fortified a hill to the south of the river but Castra Regina was designed to be the headquarters of a Roman legion, built in stone and right on the banks of the Danube.
Following the fall of the Roman Empire, Regensburg was ruled by Bavarian counts and then became part of the Frankish empire under Charlemagne. When that empire split into two, Regensburg was the natural capital for the eastern Franks.
This prestigious position as an Imperial centre and the crucial location on major trade routes helped the city expand along the Danube and made some of its inhabitants extremely rich. The Stone Bridge across the Danube (see lower) encouraged trade between northern Europe and Venice to reach new heights and Regensburg became a Free Imperial City in the mid-13th century.
This status showcased the growing power of the merchants versus the nobility and bishops and also led to some of the most important medieval building projects which still stand in the old town, such as the Cathedral of St Peter and the Old Town Hall.
The merchant classes had however taken on a powerful opponent in the Bavarian dukes, who controlled the surrounding territory. Eventually they managed to bring the city to such a state that it voluntarily handed its hard-won freedom to Bavaria.
The Thirty Years' War and bouts of plague affected Regensburg as with any other central European location - it lost one in five of its population in one major outbreak - but the city recovered quickly due to the Perpetual Diet being held in Regensburg.
The Imperial Diet was the name given to a meeting of princes, electors and city representatives which functioned as an assembly in the Holy Roman Empire. At this time, the Holy Roman Emperor was obliged to follow the decisions of the Diet and his only power was not to call it into session.
Thus the Perpetual Diet, which never finished its session and lasted from the mid-17th century through to the beginning of the 19th century, became in essence the first German government.
The dissolution of the Empire and the loss of power and prestige to Munich meant that Regensburg became something of a backwater. It survived the Second World War with little damage and has boomed in the late 20th and early 21st centuries. Nowadays it is the fourth largest city in Bavaria (after Munich, Nuremberg and Augsburg) and is the capital of the Upper Palatinate region of the state.
Since 2006 the old town of Regensburg has been listed as part of the UNESCO World Cultural Heritage. Nearly 1000 buildings are protected by the UNESCO listing.
The Stone Bridge, which links the old town of Regensburg across various islands to the other bank of the River Danube, is one of the symbols of Regensburg.
This is hardly surprising as it is the oldest surviving bridge in Germany - having been constructed way back in the 12th century.
The bridge was not only important for linking the two sides of the river but for its function as a permanent trade crossing of the Danube even in times of flood and ice.
The uneven pillars and arches were constructed on foundations of wood, which were then protected against debris and ice by large oval bulwarks. These in turn cause a strong current to run between the pillars which was used by watermills which in turn contributed towards the costs of bridge upkeep.
The bridge is now closed to traffic and has undergone extensive renovation to deal with the damage of centuries of traffic. There is also very little river traffic that now passes under the bridge. Because of the strong currents mentioned previously, a canal was constructed on the flood plains of the river to the north which is now used by the regular Danube shipping. Private boats and smaller excursion boats can still use the passage under the bridge.
One of the favourite stopping points after a morning spent traipsing around the city sights is at the Historic Sausage Kitchen near the Stone Bridge.
It stands on the spot where, from the 12th century onwards, a similar stand fed the dockworkers who served the regular shipping traffic on the Danube. In those days the fast food was boiled meat.
The current building dates from the 17th century and has, since the 1800s, served homemade sausages cooked on a charcoal grill.
The traditional way to eat these sausages is the slightly saucy "Sechs auf Kraut" ('six on a plate with sauerkraut'). Those with a greater hunger or not wishing to be misunderstood can order eight or ten.
The other great Regensburg sausage heritage is the 'Knackersemmel' - again a grilled sausage - but this time larger - cut in half lengthways and served in a crunchy roll with traditional sweet mustard, horseradish and gherkin slices.
It originated at the first Christmas market held after the Second World War. Descendants of the sausage stand owners who introduced it can still be found in the Neupfarrplatz in the old town from Monday to Saturday.
Sigmaringen is a small, picturesque town with a rich history. Its medieval castle is perched on a limestone cliff above the Danube.
Ulm is a bustling city with a vibrant atmosphere. It is famous for the record-breaking church steeple and a picturesque old town.
Neuburg an der Donau offers a charming blend of history and natural beauty. The town's Renaissance castle is a must-see.
Ingolstadt is famous for being the birthplace of car manufacturer Audi. The city blends its industrial heritage with a vibrant cultural scene.
Kelheim is a town surrounded by natural beauty. The stunning Danube Gorge nearby offers an opportunity to visit Weltenburg Abbey.
Straubing is known for its winter carnival traditions. The historic old town is home to some beautiful buildings and charming squares.
Deggendorf in the Bavarian Forest is a gateway to nature. The town's surroundings are perfect for hiking, skiing, and exploring the scenic landscapes.
Passau, the "City of Three Rivers," is where the Danube, Inn, and Ilz rivers converge. Its location and historical landmarks, make it popular with cruise ships.
The tourist office is located in the pedestrian area at the heart of Regensburg's old town in the former town hall. It is open all year round - apart from Christmas Day and New Year's Day - with slightly restricted opening hours on Sundays in winter.