Final answer:
Malbork Castle is the largest brick castle in the world, designated as a UNESCO World Heritage site in 1997, built in the 13th century by the Teutonic Knights in Poland.
Step-by-step explanation:
The castle referenced in the question, which is the largest brick castle in the world and was designated a UNESCO World Heritage site in 1997, is Malbork Castle. Also known as the Castle of the Teutonic Order in Malbork, it is located in Poland and was constructed in the 13th century by the Teutonic Knights. It is renowned for its vast size and majestic Gothic architecture, and it serves as a stunning example of medieval military construction.