The Awful Tower is the headquarters of Simon Voltaire, the Master of Paris.
The Europan analog of Europe's Eiffel Tower. The French of our world initially thought of this architectural folly as a great eyesore, but eventually came to treasure it. It now stands as a monument to French engineering. The Awful Tower stands as a monument to the Spark in Europa's version of Paris.
There's also some trans-dimension resonance with the Centre Pompidou.