Chillon Castle

Chillon Castle  (France: Château de Chillon) is located on the shore of Lake Geneva in the commune of Veytaux, at the eastern end of the lake, 3 km from Montreux, Switzerland. The castle consists of 100 independent buildings that were gradually connected to become the building as it stands now.

This is a file from Wikimedia Commons, Author    Bolla Ugo, License

The first written record of the castle is in 1160 or 1005, although, according to some sources, the first fortification on the site of the present Chillon Castle was built around the 9th century. Its goal was to protect the road running from Avenches to Italy through the pass Grand-Saint-Bernard along Lake Geneva. 

Neuschwanstein Castle

Neuschwanstein Castle (German: Schloss Neuschwanstein, [nɔʏˈʃvaːnʃtaɪn], literally: "The new swan rock") is a 19th-century Romanesque Revival palace on a rugged hill above the village of Hohenschwangau near Füssen in southwest Bavaria, Germany.

This is a file from the allcastle.info

Neuschwanstein Castle stands on the site of two castles, Vorderhohenschwangau Castle and Hinterhohenschwangau Castle. For technical reasons the ruined castles could not be integrated into the plan. In 1868, the ruins of the medieval twin castles were demolished completely; the remains of the old keep were blown up. Furthermore, King Ludwig II ordered to lower the plateau of about 8 m by an explosion rocks at this place and thus create space for the construction of "fairy palace." After the construction of the road and pipeline 5 September 1869 the foundation was laid for the construction of a huge castle.  Construction of the castle was requested court architect Eduard Riedel. The building design was drafted by the master of Munich Christian Jank.

Predjama Castle

Predjama Castle (Slovene: Predjamski Grad or Grad Predjama, German: Höhlenburg Lueg, Italian: Castel Lueghi) is a Renaissance castle built within a cave mouth in southwestern Slovenia. It is located approximately 11 kilometres on north west of the town Postojna.

Predjama Castle was probably built in the 12th century but was first mentioned in the year 1274 with the German name Luegg. It was built in an area that was controlled by the town of Aquilea but was contested by the Counts of Gorizia. The castle was built under a natural rocky arch high in the stone wall to make access to it difficult. In those times the castle was called Jama Castle (Jama translates to cave).It was later acquired and expanded by the Luegg noble family, also known as the Knights of Adelsberg (the German name of Postojna).