If you stumble upon this strange looking structure, don’t be scared, as stepping inside will reveal a very modern and cozy interior. It’s located atop Seven Mountains in Bergen, Norway, and officially called the ‘Tubakuba’ cabin. For those wondering, yes, the 150-square-foot building is entered by crawling through a tunnel comprising of curved pine shavings covered in untreated larch that turns gray over time. All of the wood has been treated with a 19th century traditional Japanese method called Shou Sugi Ban to prevent fungal decay and damage. This “off-the-grid hotel room” is available lounging during the day, and can also be rented for free to families with young children. Continue reading for more pictures and information.