The Château de Bonaguil, a medieval castle located in southwestern France, on the border between the departments of Lot-et-Garonne and Dordogne. It is famous for its impressive defensive architecture and is considered one of the last examples of medieval castle architecture in France.
It was built in the 13th century, but was entirely restructured at the end of the 15th and beginning of the 16th centuries by Bérenger de Roquefeuil, who added all of the defensive improvements of the end of the Middle Ages. A marvel of military architecture covering 7500 m2, incorporating the latest developments in artillery (both for defence and in adapting the defences for protection against it). It was, however, obsolete when completed. It was never attacked.
Sacsayhuaman ruins near the city of Cusco in Peru, an Inca period fortress/castle approximately 12,000 ft ASL in the Andes mountains.
By Tydence Davis from Las Vegas - Sacsayhuaman Panorama, CC BY 2.0, File:Sacsayhuaman Panorama.jpg - Wikimedia Commons
Although built much later than the British Isles Stonehenge and the Egyptian Pyramids, with construction of this fortress ending in the early-1400s AD, it is interesting to note that some of the larger stones exceed 200 tons and the methods the Inca used to move them are very similar to how the Europeans and Middle East cultures moved their megaliths. Some were moved from quarries over 20 miles away. There are fairly detailed existing records of the construction methods due to the historians who accompanied the early Spanish invaders.
Kokořín Castle Built in the first half of the 14th century by Beneš of Vartemberk, Kokořín Castle has stood tall over the Kokořínský důl valley for centuries, as a silent witness to history.
Destroyed during the Hussite Wars, the castle lay in ruins for centuries until it was rebuilt in the Romantic spirit in the 19th century. Today, the castle is not only charming for its architecture but also for the atmosphere of ancient legends and stories about the knights who defended these walls.