Malbork Castle: The Largest Castles in the World

Malbork Castle, Malbork, Poland
The castle of the Teutonic Order in Malbork is the largest castle in the world by surface area, and the largest brick building in Europe. It was built in Prussia by the Teutonic Knights. 

The castle is a classic example of a medieval fortress and, on its completion in 1406, was the world's largest brick castle. UNESCO designated the "Castle of the Teutonic Order in Malbork" and the Malbork Castle Museum as the World Heritage Site in December 1997. It is one of two World Heritage Sites in the region with origins in the Teutonic Order.

The castle was expanded several times to house the growing number of Knights. Soon, it became the largest fortified Gothic building in Europe, on a nearly 52-acre site. The castle has several subdivisions and numerous layers of defensive walls. It consists of three separate castles - the High, Middle and Lower Castles, separated by multiple dry moats and towers. The castle once housed approximately 3,000 "brothers in arms". The outermost castle walls enclose 52 acres, four times the acreage of the enclosed space of Windsor Castle. The developed part of the property designated as a World Heritage Site is 44.57 acres.