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Location: Edinburgh, Scotland. Historical Fact: Edinburgh Castle has a complex building history, and the oldest part, St Margaret's Chapel, dates back to the 12th century.

Location: Bavaria, Germany. Historical Fact: Neuschwanstein Castle was commissioned by Ludwig II of Bavaria as a retreat and as an homage to Richard Wagner, the King's inspiring muse.

Location: Conwy, Wales. Historical Fact: Conwy Castle is a medieval fortification in Wales, built by Edward I during his conquest of Wales between 1283 and 1289.

Location: Malbork, Poland. Historical Fact: Malbork Castle was constructed by the Teutonic Knights and is the largest castle in the world measured by land area.

Location: Windsor, England. Historical Fact: Windsor Castle is the oldest and largest inhabited castle in the world and has been home to British royalty for over 900 years.

Location: Heidelberg, Germany. Historical Fact: Heidelberg Castle is a mix of styles from Gothic to Renaissance and was the residence for most of the Electoral Palatinate during the Holy Roman Empire.

Location: Chambord, France. Historical Fact: The Château de Chambord is one of the most recognizable châteaux in the world because of its very distinctive French Renaissance architecture.

Location: Granada, Spain. Historical Fact: The Alhambra is a palace and fortress complex that dates back to AD 889 and was later converted into a royal palace by Yusuf I, Sultan of Granada.

Location: Spiš Region, Slovakia. Historical Fact: Spiš Castle was built in the 12th century, is one of the largest castle compounds in Central Europe, and it's a UNESCO World Heritage site.

Location: Himeji, Japan. Historical Fact: Himeji Castle is considered the finest surviving example of prototypical Japanese castle architecture and is a UNESCO World Heritage site.

Location: Homs Governorate, Syria. Historical Fact: Krak des Chevaliers was a significant Crusader castle and one of the most important preserved medieval military castles in the world.

Location: Apulia, Italy. Historical Fact: Castel del Monte was built in the 13th century by Emperor Frederick II and is known for its unique octagonal shape and its mathematical and astronomical precision.

Location: Transylvania, Romania. Historical Fact: Bran Castle, often marketed as 'Dracula's Castle', is a national monument and landmark in Romania built on the border between Transylvania and Wallachia.

Location: Normandy, France. Historical Fact: Mont Saint-Michel is built on a rocky island and has been a strategic fortification since ancient times, later becoming a monastery.

Location: Kent, England. Historical Fact: Leeds Castle, known as 'The Loveliest Castle in the World', dates back to 1119 and has been used as a palace by Henry VIII and as a residence for queens of England.

Location: Prague, Czech Republic. Historical Fact: Prague Castle is known for being the largest coherent castle complex in the world, with an area covering 70,000 square meters.

Location: Hampshire, England. Historical Fact: Highclere Castle is a country house in the Jacobethan style, with a park designed by Capability Brown and is famous today for being the filming location of Downton Abbey.

Location: San Marino. Historical Fact: Guaita Tower is one of three peaks which overlooks the city of San Marino, the country's capital, and it served as a prison.

Location: Wallachia, Romania. Historical Fact: Poenari Castle is known for its connection to Vlad the Impaler, the inspiration for Bram Stoker's Dracula, and requires climbing 1,480 stairs to reach.