Portable sauna

There are some interesting portable saunas around, which can be taken from one place to another on the back of the truck. Or even more extreme - some actually drive (or float) around themselves.

They come in all shapes and sizes from a floating SAAB to minibusses to large buses to fire trucks or floating barges.
Some interesting portable saunas:

• Saunaab
  
• Autosaun
• Floating saunas at Soomaa
• Old utility vehicle sauna - I've personally used this at a whitewater rafting event
• a great collection of other mobile saunas