Officially called the Mega Underground Bike Park, it’s currently touted as the largest indoor bike park in the world, situated 10 stories (100 ft/30.5 m) underground in an old limestone mining cavern. It’s located in Louisville, Kentucky, measures 320,000 sq ft (29,729 sq m) and features over 45 looping dirt trails, including jump lines, pump tracks, dual slalom, BMX, as well as an easier-to-ride single track. Best of all, the temperature remains a comfortable 60°F (15°C), year-round. Click here to view the first image in this week’s geek life gallery. Continue reading for a viral video of the world’s first and only Magneto Cat.