U.S. breweries take note. If you’re trying to entice more people into your tasting room, forget modifying your menu or offering more exciting tours, and do what Starkenberg Brewery did—build a beer hot tub. The Austrian brewery turned one of its fermenting vats into a beer pool guests can lounge in. The hot tub, which is filled with warm, bitter beer, is perfect for a dip with a pint. And if you finish off your stein—and you don’t mind warm beer—feel free to take a gulp.