"Built in the 19th century and once the largest structure in the world, I find the Palace of Justice an awe-inspiring and controversial monument—covering 26,006 square meters, it required the demolition of over 3,000 homes, cost roughly 45 million Belgian Francs (about $300 million today), and is actually larger than St. Peter’s Basilica; you can walk the main hallways for free to admire the huge marble staircases, columns, and statuary, though the exterior has been covered in scaffolding since 1984." - Matthew Kepnes