Alcazar of Toledo, Spain

Perched atop an ancient hill overlooking the Tagus River in Toledo, this majestic fortress stands as one of Europe's oldest military structures still used for its original purpose. Its formidable walls are adorned by autumn-hued trees casting reflections upon the tranquil river below. A stone bridge arches gracefully across to lead visitors into what has been a royal residence since medieval times, now open to explore its rich history and impressive architecture under a sky streaked with wispy clouds.