Title: Habsburg Castle
Content:  [[Image:Habsburg castle (1250) basic structure and stages.jpg|thumb|250px|The castle in 1250, seen from the north. ██ Built before 1100. 1600 in ruins. ██ Built between 1100 and 1250. 1600 in ruins. ██ Built before 1100. 1600 still standing. ██ Built between 1100 and 1250. 1600 still standing. Except for the chapel, the green and orange colored buildings still exist today.]] Habsburg Castle (Schloss Habsburg) is a medieval fortress located in what is now Habsburg, Switzerland, in the canton of Aargau, near the Aar River. At the time of its construction, the location was part of the Duchy of Swabia. Habsburg Castle is the original seat of the House of Habsburg, which became one of the leading imperial and royal dynasties in Europe. It is listed as a Swiss heritage site of national significance.
Title: Capital of Germany
Content:  Prior to 1871, Germany was not a unified nation-state, and had no capital city. The medieval German Holy Roman Empire, used to have Aachen as its preferred seat of government during Charlemagne's reign, and until 1531 it was the place where 31 Holy Roman Emperors were crowned Kings of the Germans. The coronation later moved to Frankfurt. However, after Charlemagne, none of the subsequent Holy Roman Emperors moved to Aachen or Frankfurt, instead retaining their own original constituent kingdom or principality as base or moving into temporary Royal palaces dotted around the confederate realm known as Kaiserpfalz. The last imperial ruling house (the Habsburgs) had Vienna as its permanent seat of government. After the Congress of Vienna created the formal German Confederation in 1815, a Federal Assembly convened at the Free City of Frankfurt, representing not the people of the individual German Lands but their sovereigns. Subsequently, Frankfurt briefly became the official German capital during the short-lived Revolutions of 1848 in the German states.
Title: Habsburg Monarchy
Content:  the Austro-Hungarian Empire and survived until 1918. It collapsed following defeat in the First World War. In historiography, the Habsburg Monarchy (of the Austrian branch) is often called "Austria" by metonymy. Around 1700, the Latin term monarchia austriaca came into use as a term of convenience. Within the empire alone, the vast possessions included the original hereditary lands, the Erblande, from before 1526; the lands of the Bohemian crown; the formerly Spanish Netherlands from 1714 until 1794; and some fiefs in Imperial Italy. Outside the empire, they encompassed all the lands of the crown of Hungary as well as conquests made at the expense of the Ottoman Empire. The dynastic capital was Vienna, except from 1583 to 1611, when it was in Prague.
Title: Grand title of the emperor of Austria
Content:  Habsburg was the original seat of the House of Habsburg.
Title: Hofburg
Content:  The Hofburg is the former principal imperial palace of the Habsburg dynasty. Located in the centre of Vienna, it was built in the 13th century and expanded several times afterwards. It also served as the imperial winter residence, as Schönbrunn Palace was the summer residence. Since 1946 it is the official residence and workplace of the president of Austria. Since 1279 the Hofburg area has been the documented seat of government. The Hofburg has been expanded over the centuries to include various residences (with the Amalienburg and the Albertina), the imperial chapel (Hofkapelle or Burgkapelle), the imperial library (Hofbibliothek), the treasury (Schatzkammer), the Burgtheater, the Spanish Riding School (Hofreitschule), the imperial mews (Stallburg and Hofstallungen). The palace faces the Heldenplatz (Heroes Square) ordered under the reign of Emperor Franz Joseph I, as part of what was planned to become the Kaiserforum but which was never completed. Numerous architects have executed work at the Hofburg as it expanded, notably the Italian architect-engineer Filiberto Luchese, Lodovico Burnacini and Martino and Domenico Carlone, the Baroque architects Lukas von Hildebrandt and Joseph Emanuel Fischer von Erlach, Johann Fischer von Erlach, and the architects of the Neue Burg built between 1881 and 1913.
Title: Hofburg, Innsbruck
Content:  The Hofburg (Imperial Palace) is a former Habsburg palace in Innsbruck, Austria, and considered one of the three most significant cultural buildings in the country, along with the Hofburg Palace and Schönbrunn Palace in Vienna. The Hofburg is the main building of a large residential complex once used by the Habsburgs that still includes the Noblewomen's Collegiate Foundation, the Silver Chapel, the Hofkirche containing Emperor Maximilian's cenotaph and the Schwarzen Mandern, the Theological University, the Tyrolean Folk Art Museum, Innsbruck Cathedral, the Congress, and the Hofgarten (Court Garden). The original Hofburg palace was constructed from several elements under Archduke Sigismund 
Title: Habsburg, Switzerland
Content:  Habsburg is a municipality in the district of Brugg in canton of Aargau in Switzerland. It lies about three kilometres southwest of the town of Brugg, the capital of the district of Brugg. Habsburg is named after Habsburg Castle, built around 1020-1030 for Count Radbot of the nearby county of Klettgau in the Duchy of Swabia, which Habsburg was also a part of at the time.
Title: Graz
Content:  Turks in 1529 and 1532. Apart from the Riegersburg Castle, the Schlossberg was the only fortification in the region that never fell to the Ottoman Turks. Graz is home to the region's provincial armory, which is the world's largest historical collection of late medieval and Renaissance weaponry. It has been preserved since 1551, and displays over 30,000 items. From the earlier part of the 15th century, Graz was the residence of the younger branch of the Habsburgs, which succeeded to the imperial throne in 1619 in the person of Emperor Ferdinand II, who moved the capital to Vienna. New fortifications were built on the Schlossberg at the end of 
Title: House of Habsburg
Content:  was elected King of the Romans. Taking advantage of the extinction of the Babenbergs and of his victory over Ottokar II of Bohemia at the battle on the Marchfeld in 1278, he subsequently moved the family's power base to Vienna, where the Habsburgs ruled until 1918. The throne of the Holy Roman Empire was continuously occupied by the Habsburgs from 1440 until their extinction in the male line in 1740 and, after the death of Francis I, from 1765 until its dissolution in 1806. The house also produced kings of Bohemia, Hungary, Croatia, Spain, Portugal and Galicia-Lodomeria, with their respective colonies; rulers of several 
Title: Vienna
Content:  duchy of Austria. Each succeeding Babenberg ruler expanded the march east along the Danube, eventually encompassing Vienna and the lands immediately east. In 1145, Duke Henry II Jasomirgott moved the Babenberg family residence from Klosterneuburg in Lower Austria to Vienna. From that time, Vienna remained the center of the Babenberg dynasty. In 1440, Vienna became the resident city of the Habsburg dynasty. It eventually grew to become the de facto capital of the Holy Roman Empire (800–1806) in 1437 and a cultural center for arts and science, music and fine cuisine. Hungary occupied the city between 1485 and 1490. In the 16th and 17th centuries Christian forces twice stopped Ottoman armies outside Vienna, in the 1529 Siege of Vienna and the 1683 Battle of Vienna. The Great Plague of Vienna ravaged the city in 1679, killing nearly a third of its population.

Question: where was the capital of the habsburg empire located?
Answer: Prague.
Vienna.