Spain's oldest castle that's over 1,000-years-old in an underrated beautiful town / Small town of just 6,000 people invites ELON MUSK to buy their sprawling Medieval castle to set up new European HQ / Polish town begs Elon Musk to buy its 13th Century castle with rich history for wild reason / Europe's 'unforgettable' castle town built to be invisible that's the continent's 'oldest' / The fairytale-like castle in beautiful European country now a haven for dark tourism / Must-visit: The oldest castle in Spain that's nestled in inland Andalucia and dubbed 'the fort of the seven kings' / Must-visit: The medieval castle in Spain transformed into a luxury hotel and Michelin star restaurant / Hidden European town has 70p wine, fairytale castles and underground tunnels / Inside Spain: 10,000 crumbling castles and Galicia's 'pyromaniac' ad / The fairytale castle in Europe built into a cave with hidden tunnels