Red Bull's billionaire owner hunts for hidden jewels in Austrian Alps

Red Bull billionaire Dietrich Mateschitz has made no secret of his love for adrenaline-fueled extreme sports.

The 75-year-old pilot and skiing enthusiast sponsors sports like mountain-biking and paragliding to portray his energy drink as the stuff of adventure. With a net worth of about $11 billion according to the Bloomberg Billionaires Index, the Austrian entrepreneur also owns two Formula One racing teams and the German football club, RB Leipzig.

More discreetly, he has been on a decade-long acquisition spree in the Austrian Alps, buying castles and villas from churches or aristocratic families that couldn’t afford their upkeep. His holdings include