Step into France's Saint-Eustache cathedral, and—unlike most places of worship—you won't be asked to turn your cellphone off. Instead, you'll be told to send a text message to the building, which is then converted into part of a laser show.
Watch out, the ground will change beneath your feet at the Sacré Coeur in Casablanca. As part of the installation Magic Carpet 2014, an interactive light show swirls, swarms, and shimmers under the cathedral's vaunted arches. It's even more thrilling to watch the lights in action in the video below.
The Queen may have Buckingham Palace, Nicholas Cage may own half of Europe's castles, but Don Justo has this beautiful cathedral of trash. He's been building it in Madrid for 50-odd years now, and is almost finished.