Is there a castle in the UK that has never been taken or breached?

No, there are no castles in the UK that have never been taken or breached. Throughout the country's history, many castles have undergone significant conflicts, sieges, and transformations. However, the following castles are known for their remarkable resilience and have withstood lengthy sieges and attacks while remaining unconquered:

1. Dover Castle (Kent, England):

Dover Castle commands majestic views of the English Channel and stands as one of England's most formidable strongholds. Its formidable design and natural defensive advantages, such as high cliffs and fortifications, allowed it to resist attacks effectively throughout its long history. Despite several attempts and sieges, Dover Castle remained unconquered and fulfilled its role as a powerful defensive structure for centuries.

2. Windsor Castle (Berkshire, England):

Windsor Castle, an ancient and iconic residence for British monarchs, boasts an impressive history of invincibility. Its robust fortress-like design and strategic placement have enabled it to withstand potential conflicts and sieges successfully. While minor attempts at capturing Windsor Castle occurred, none were successful, making it one of England's unconquered castles.

3. Edinburgh Castle (Edinburgh, Scotland):

Edinburgh Castle, perched atop a volcanic crag in Scotland's capital, commands awe-inspiring views and has weathered numerous battles throughout history. Its commanding position and intricate defense systems rendered it impenetrable and protected the Scottish crown jewels for centuries. Despite its strategic importance, Edinburgh Castle has never fallen to an external enemy force.

4. Caerphilly Castle (Caerphilly, Wales):

Located in South Wales, Caerphilly Castle is a formidable water castle constructed during the 13th century. Its innovative concentric design, featuring two rings of walls and multiple towers, made it extraordinarily challenging for attackers to penetrate. Despite several conflicts, Caerphilly Castle remained unconquered and stands today as a testament to its exceptional resilience.