This is simply unbelievable. The Miniatur Wunderland model railroad in Hamburg, Germany is the largest in the world, covering 16,146 square feet of space with more than 10,000 train cars running around its 6.8 miles of HO scale track. Now, the makers of this huge layout have created a video that gives you a jaw-dropping look at the vast scope of this intricate work of art. Its construction started in 2000, and is still underway, with a tiny airport due for completion by the end of this year. This is just the beginning — there are plans to double to...