By @ hoosie

It is situated on a rocky hill, approximately 85 meters high, on the banks of the Danube River.
The castle can be seen from afar. In the vicinity of Bratislava, one can find the Slovak Parliament area and walking paths along the famous Zámocká Street.

It was initially built by the Venetians in the southwest coast of the Peloponnese region, later it was used by the Ottomans and French.

The castle is on a hill on the eastern coast of the Peloponnese, overlooking the town of Astros. It was originally built in 1256 AD by a Frankish Prince, historically known as ‘Castello della Estella’, meaning Castle of the Star.

Source of the pictures here, here, here, here and here. Reconstruction of the city made by Jean-Claude Golvin

Hohenzollern Castle sits dramatically atop the 855 m Mount Hohenzollern near Hechingen in Baden-Württemberg, Germany. It is the ancestral seat of the House of Hohenzollern, the dynasty that produced the Electors of Brandenburg, the Kings of Prussia, and the German Emperors.

The site has held three successive castles. The first (probably early 11th century) was destroyed after a long siege in 1423. A second, larger fortress was built starting in 1454 and stood for centuries before falling into ruin. The current neo-Gothic castle was commissioned by King Frederick William IV of Prussia and built between 1850 and 1867 (architect Friedrich August Stüler) as a romantic dynastic memorial on the medieval foundations. It was inaugurated under his brother, King Wilhelm I.

It remains privately owned by the Hohenzollern family and is open to visitors (guided tours, museum displays including Prussian crown jewels and personal items of Frederick the Great, plus panoramic views). The spiral fortified approach road and the way the castle seems to grow out of the forested peak make it one of the most visually striking hilltop castles in Europe.

Barbakan Warszawski... a historic semicircular red-brick fortress

This is the only part left of York Castle

Could anyone help identify these castles? They may be the same castle from different views? I believe these are originals and on is signed (unintelligible) and dated C. 1865. Thanks :)

Author and source: J.G. O'Donoghue.

Pfalzgrafenstein Castle was built in the 14th century on a small island in the middle of the Rhine River near Kaub, Germany.

Erbaut Mitte des 16. Jh als Renaissance-Jagdschloß der sächsischen Kurfürsten wurde es ab 1723 von Kurfürst August dem Starken zum barocken Jagd - und Lustschloss ausgebaut. Umgeben von einem weitläufigen Waldgebiet mit vielen künstlichen Teichen gibt es hier auch den einzigsten Leuchtturm Sachsens.

Built in the mid-16th century as a Renaissance hunting lodge for the Electors of Saxony, it was expanded by Elector Augustus the Strong starting in 1723 into a Baroque hunting and pleasure palace. Surrounded by an extensive forest area featuring numerous artificial ponds, the site is also home to Saxony's only lighthouse.