The first royal residence on the Castle Hill was built by King Béla IV of Hungary between 1247 and 1265. It is uncertain whether it was situated on the southern tip of the hill or on the northern elevation, near the Kammerhof.

The oldest part of the present-day palace was built in the 14th century by Stephen, Duke of Slavonia, who was the younger brother of King Louis I of Hungary. Only the foundations remain of the castle keep, which was known as Stephen's Tower (Hungarian: István-torony). The Gothic palace of King Louis I was arranged around a narrow courtyard next to the keep.

King Sigismund significantly enlarged the palace and strengthened its fortifications. Sigismund, as a Holy Roman Emperor, needed a magnificent royal residence to express his prominence among the rulers of Europe. He chose Buda Castle as his main residence, and during his long reign it became probably the largest Gothic palace of the late Middle Ages. Buda was an important artistic centre of the International Gothic style.

Construction began in the 1410s and was largely finished in the 1420s, although some minor works continued until the death of the king in 1437. The palace was first mentioned in 1437, under the name "fricz palotha".

The most important part of Sigismund's palace was the northern wing, known as the Fresh Palace (Hun: Friss-palota). On the top floor was a large hall called the Roman Hall (70 × 20 m or 230 × 66 ft) with a carved wooden ceiling. Great windows and balconies faced toward the city of Buda. The façade of the palace was decorated with statues, a and coat-of-arms. In front stood the bronze equestrian statue of Sigismund, later repaired by King Matthias Corvinus.

The first reconstruction plan of the medieval remains was written by László Gerő in 1950 and finalised in 1952. The reconstruction work was finished in 1966. Contrary to the generally accepted principles of historic reconstruction, the medieval fortification system was rebuilt in its entirety. 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. The low-lying southern wing of the Gothic palace was also reconstructed, together with the vaulted Gothic Hall and the Lower Church of the former Royal Chapel. Medieval-style gardens were planted in the zwingers. The foundation of the Stephen's Tower was unearthed, but as archaeological evidence was lacking, the tower was not reconstructed. The remains of the Broken Tower were covered again.

In the gardens of Buda Castle is a statute dedicated to Johannes Müller von Königsberg, called Regiomontanus, who as arguably the most important astronomer of the fifteenth century. Born in the Franconian town of Königsberg in 1436, he was educated at the Universities of Leipzig and Vienna, and appointed to the Arts Faculty of the latter institution in 1457. Georg Peurbach or Peuerbach (1423-1461), Regiomontanus' astronomical mentor, was also a Master at Vienna, and the two men collaborated by, among other things, making observations together. On his deathbed, Peurbach charged Regiomontanus with completing an abridgement of Ptolemy's Syntaxis he had begun at the behest of Cardinal Johannes Bessarion. This work was finished by 1463, and printed as the Epitome of the Almagest in 1496; it was later used by such astronomers as Copernicus and Galileo.

The equestrian statue of Prince Eugene of Savoy stands on the Danube terrace, in a prominent position, high above Budapest. The Neo-Baroque statue was made by sculptor József Róna for the town of Zenta, but the town could not afford the price. The monument was bought in 1900 as a temporary solution until the planned equestrian statue of King Franz Joseph was completed. This never happened, so Prince Eugen remained on his plinth. The plinth is decorated with two bronze reliefs showing the capture of the earth-works in Zenta and the decisive cavalry charge in the Battle of Zenta in 1697.

The Liberty Statue or Freedom Statue is a monument on the Gellért Hill in Budapest, Hungary. It commemorates those who sacrificed their lives for the independence, freedom, and prosperity of Hungary

It was first erected in 1947 in remembrance of what was then referred to as the Soviet liberation of Hungary during World War II, which ended the occupation by Nazi Germany. Its location upon Gellért Hill makes it a prominent feature of Budapest's cityscape.

The 14 m tall bronze statue stands atop a 26 m pedestal and holds a palm leaf. 

The light walk is the est way to explore and see what Castle hiddes

An  evning look on Buda Castle,captureed from Chain Bridge, reflecting lights in Danube RIver