The Landhotel Moorhoff in Franking, Austria and the Beer Spa Bahenec in Pisek, Czech Republic, offer similar bathing experiences, but replace the traditional tub with a beer-style barrel.

BBC: Bathe at a beer spa

It's a 10-meter-long, 120-centimeter deep, fully automated stainless steel tub that produces pasteurized eggs by bathing them for about an hour in water that is precisely controlled to a temperature (the exact one is secret) between 54 and 66 degrees C.

FORBES: The Yolk's On Him

It's a 30-foot-long, 4-foot-deep, fully automated stainless steel tub that produces a pasteurized egg by bathing it for about an hour in water that is precisely controlled to between 128 and 150 degrees (the exact temperature is secret)--hot enough to kill salmonella and other dangerous microbes without cooking the egg, (see sidebar).

FORBES: The Yolk's On Him