As soon as I learned about the major attraction in Malbork, Poland, I knew I had to take a side trip from my base in Gdansk, an hour to the northwest by train. I couldn’t resist seeing the largest brick structure ever built—Malbork Castle. At the size of about 40 U.S. football fields and with its oldest parts going back to the 1200s, this massive complex had the sudden and significant impact on me that its statistics assured me it would. Read more about Malbork Castle >