Nature Studies (manuscript)

The Austrian National Library (German: Österreichische Nationalbibliothek) is the largest library in Austria, with more than 12 million items in its various collections. The library is located in the Neue Burg Wing of the Hofburg in center of Vienna. Since 2005, some of the collections have been relocated within the Baroque structure of the Palais Mollard-Clary. Founded by the Habsburgs, the library was originally called the Imperial Court Library (German: Kaiserliche Hofbibliothek); the change to the current name occurred in 1920, following the end of the Habsburg Monarchy and the proclamation of the Austrian Republic. The library complex includes four museums, as well as multiple special collections and archives.

The Imperial Sword (Latin: Gladius Imperatoria, German: Reichsschwert) is one of the four most important parts of the Imperial Regalia (Reichskleinodien) of the Holy Roman Empire. During a coronation, it was given to the emperor along with the Imperial Crown (Reichskrone), Imperial Sceptre (Reichszepter), and the Imperial Orb (Reichsapfel). All four parts of the Imperial Regalia are displayed in the Imperial Treasury at the Hofburg Palace in Vienna, Austria. It is also known as Mauritiusschwert, or the sword of Saint Maurice.

The Vienna Coronation Gospels, also known simply as the Coronation Gospels (German: Krönungsevangeliar), is a late 8th century illuminated Gospel Book produced at the court of Charlemagne in Aachen. It was used by the future emperor at his coronation on Christmas Day 800, when he placed three fingers of his right hand on the first page of the Gospel of Saint John and took his oath. Traditionally, it is considered to be the same manuscript that was found in the tomb of Charlemagne when it was opened in the year 1000 by Emperor Otto III. The Coronation Evangeliar cover was created by Hans von Reutlingen, c. 1500. The Coronation Evangeliar is part of the Imperial Treasury (Schatzkammer) in the Hofburg Palace in Vienna, Austria (Schatzkammer, Inv. XIII 18).

The Imperial Treasury (German: Kaiserliche Schatzkammer) at the Hofburg Palace in Vienna, Austria contains a valuable collection of secular and ecclesiastical treasures covering over a thousand years of European history. The entrance to the treasury is at the Schweizerhof (Swiss Courtyard), the oldest part of the palace, which was rebuilt in the sixteenth century in the Renaissance style under Holy Roman Emperor Ferdinand I. The Imperial Treasury is affiliated with the Kunsthistorisches Museum, and houses in 21 rooms a collection of rare treasures that were compiled by the Imperial House of Habsburg over the course of centuries, including the Imperial Crown, Orb, and Sceptre of Austria, and the Imperial Regalia of the Emperors and Kings of the Holy Roman Empire, including the Imperial Crown of the Holy Roman Empire.The Imperial Treasury is divided into two collections: the secular collection and the ecclesiastical collection. The secular collection contains numerous imperial artifacts from the House of Habsburg, including jewels and precious stones that due to their unique size could not be fitted into the imperial crowns. Like all secular treasuries, it was designed to attest to the political power and geographical reach of their owners. The ecclesiastical collection contains numerous religious treasures, including relics and objects ascribed to the private ownership of saints.

The Agate Bowl (German: Achatschale) is a hardstone carving in the shape of a bowl cut out of a single piece of agate, possibly in the fourth century at the court of Constantine, and now displayed in the Imperial Treasury at the Hofburg Palace in Vienna, Austria. For centuries it was widely regarded as the "greatest masterpiece" and the "best and most important piece" in the collection. In 1564, Holy Roman Emperor Maximillian II and his brothers declared it by deed to be an "inalienable heirloom of the house of Austria". They valued this ancient precious stone carving, not just for its craftsmanship, but for a "natural miracle" in the stone itself that reveals a mysterious inscription—the name XRISTO (Christ) at the bottom of the bowl within the grain of the stone. It is now generally believed that the inscription inspired the legend that the bowl was the Holy Grail. The Agate Bowl is the largest carved stone bowl in the world.

The Imperial Crown of Austria (German: Österreichische Kaiserkrone) is a crown formerly in use by the monarchs of the Habsburg monarchy. The crown was originally made in 1602 in Prague by Jan Vermeyen as the personal crown of Holy Roman Emperor Rudolf II, and therefore is also known as the Crown of Emperor Rudolf II (German: Rudolfskrone). The crown was used as a private crown of the Holy Roman Emperors and Kings of Hungary and Bohemia from the House of Habsburg. In 1804 it became the official crown of the newly constituted Austrian Empire. After 1867 it remained the imperial crown of the Cisleithanian part of the Austro-Hungarian Empire until 1918.

Josefsplatz (English: Joseph's Square) is a public square located at the Hofburg Palace in Vienna, Austria. Named after Emperor Joseph II, Josefsplatz is considered one of the finest courtyards in Vienna.

The Augustinian Church (German: Augustinerkirche) in Vienna is a parish church located on Josefsplatz, next to the Hofburg, the winter palace of the Habsburg dynasty in Vienna. Originally built in the 14th century as the parish church of the imperial court of the Habsburgs, the harmonious Gothic interior was added in the 18th century. The official name of church and parish is St. Augustin, but it is locally called Augustinerkirche.

The Herzgruft (German for 'Heart Crypt') is a burial chamber that protects 54 urns containing the hearts of members of the House of Habsburg. The crypt is located behind the Loreto Chapel in the Augustinian Church within the Hofburg Palace complex in Vienna, Austria.The first heart, belonging to King Ferdinand IV, was placed in the Augustinian Church on 10 July 1654, according to his wishes. The last heart, belonging to Archduke Franz Karl of Austria, was placed in the crypt on 8 March 1878. The bodies of all but three of the hearts are in the Imperial Crypt a few blocks away.

The Hofburg (German: [hoːf.buʁk]) 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.

Palais Pallavicini is a palace in Vienna, Austria. It is located in the Josefsplatz square at number 5. It has been owned by the noble Pallavicini family. It was previously built and owned by the Fries banking family (Swiss-Austrian) and is therefore also known as Palais Fries as house of Count Johann von Fries (and later of his son Count Moritz von Fries that sold it). It was built upon a monastery, erected by Elisabeth of Austria, Queen of France (widow of King Charles IX of France), closed in 1782 (the former monastic church is now the Lutheran City Church)

Palais Pálffy (English: Pálffy Palace) is a palace located on Josefsplatz in the Innere Stadt (inner city) district of Vienna, Austria. It was once owned by the noble Pálffy family. Today, the building is used for music performances and various kinds of public functions. The Phantasten Museum is located in the Palais.