The original Christian Hungarian population did not feel secure during the Ottoman conquest, their numbers significantly shrank in the next decades, due to their fleeing to the Habsburg ruled Royal Hungary.

This time the Holy League's army was much larger, consisting of 65,000–100,000 men, including German, Hungarian, Croat, Dutch, English, Spanish, Czech, Italian, French, Burgundian, Danish and Swedish soldiers and other Europeans as volunteers, artillerymen and officers.

According to contemporary sources, the explosion killed as many as 1,500 Turkish soldiers and caused a wave on the Danube that washed away artillery batteries and guards standing on the opposite shore.

The plans of the splendid, U-shaped Baroque palace with a cour d'honneur were drawn by Jean Nicolas Jadot, chief architect of the Viennese court.

The façades, some interior elements and the St. Sigismund Chapel are the works of Pacassi, while the special double false domes were probably planned by Oraschek, formerly the master builder of Count Grassalkovich.

Alexander Keglevich, rector of the Eötvös Loránd University,[8] had provided financing to Maria Theresa, which supposedly should have been repaid, according to her letters to her children and friends.

In the front, the false dome was removed and a four-storey observatory tower, planned by Franz Anton Hillebrandt or Karl Georg Zillack, was erected.

In 1778 Hillebrandt built a new chapel for the first king of Hungary, Saint Stephen's, the mummified right hand, which was recovered by Queen Maria Theresa from the Republic of Ragusa in 1771.

In 1810 the palatinal palace was damaged by fire, but in the next decades, plans were made to raise the building with an upper storey, but they were not implemented, although the observatory tower, which hindered the work, was removed.

Ambitious urban planning projects were carried out to express the growing wealth and higher status of the Hungarian capital, with special attention being paid to the rebuilding of Buda Castle.

Ybl also built a new waterworks pumping station, named Várkert-kioszk (Royal Garden Kiosk), and two stair towers against the medieval cortina walls.

In front of the long Danube façade, an equestrian statue was erected in honour of Prince Eugene of Savoy, the victorious leader of the Habsburg army in the Battle of Zenta.

The eastern forecourt was closed off with a lavish wrought-iron rail, which ended in a pillar crowned by a statue of the legendary Turul, the sacred bird of the Magyars, spreading its wings above Budapest.

The Hauszmann palace existed for around three decades: on 30 December 1916, the building played a part in the coronation ceremony of the last Hungarian king, Charles IV of Hungary.

Important elements like the 16th century Great Rondella and the medieval Gatehouse, the Mace Tower, the walls and the zwingers were reconstructed according to the results of the archaeological research and contemporary pictorial evidence.

Important exterior details, such as the main entrance, the Habsburg Steps, the dome, the Royal Stables, the guardhouse and the riding school were demolished, and the remaining façades were simplified.

On 25 July 2007 Prime Minister Ferenc Gyurcsány chose the medieval King's Cellar in Buda Castle as the place to announce the list of the "most important public works projects", which was financed by European Union funds between 2007 and 2013.

[14] The area had been previously excavated by archeologists, who discovered many important finds, including medieval children's toys and a tooth from the pet leopard of King Matthias Corvinus.

[15] However, financial difficulties interrupted the construction of the garage in 2009; work resumed for a short time in November 2011 but stopped again after the completion of the concrete basement slab.

The three Gothic double lancet windows are considered the most important architectural elements of the tower and the profiles; frames and mullions were restored in a simplified form, using many of the original stones.

The interior from the time of Maria Theresa and Franz Joseph was mostly destroyed during World War II and the post-war reconstruction, excluding the Palatinal Crypt, which survived both.

Little information exists about the interiors from the medieval and Baroque eras, but the palace built at the turn of the 20th century was meticulously recorded, using detailed descriptions, photographic documentation and grounds plans.

On 25 July 2007 Prime Minister Ferenc Gyurcsány chose the King's Cellar as the place to announce the list of the "most important public works projects", financed by European Union funds between 2007 and 2013.

In the Baroque era it was called Gesellschaft Zimmer Ihrer Majestät der Kaiserin ("Parlour of HM The Empress") and was part of Maria Theresa's private apartments.

In the Baroque era it was called Ankleide-Zimmer Ihrer Majestät der Kaiserin ("Dressing Chamber of HM The Empress") and was part of Maria Theresa's private apartments.

The two-storey high, airy room was lavishly decorated with stuccoes, half columns, trabeation, balconies and six crystal chandeliers in Neo-Baroque style.

These apartments, on the ground floor of the Krisztinaváros Wing, were designed in 1902 for Archduke Joseph August of Austria (1872–1962), the head of the Hungarian branch of the Habsburgs and his wife, Archduchess Augusta (1875–1964).

It shows a group of hunters led by King Matthias Corvinus together with hounds, a killed deer, Martius Galeotti with a hawk and Lovely Ilonka with a doe.

The statue of the Hortobágy National Park horseherd taming a wild horse originally stood in front of the Riding School in the former Újvilág terrace.

The two statues depicting Csongor and Tünde, literary figures from Mihály Vörösmarty's drama, originally decorated the Habsburg Steps in front of the palace.