In the 18th century, the residents of a small town in Denmark called Læsø would use seaweed, a resource they had in abundance, to top their homes.

Læsø is home to a total of 19 "seaweed houses," and one of them just hit the market, reports New Atlas writer Adam Williams. The House of Andrine was built in 1790, though its roof was recently installed as part of a renovation.

Technically, it's not clear whether House of Andrine is made from actual seaweed or if eelgrass was used – it's similar to a layperson but there is a difference (eelgrass is a plant and seaweed is algae). The roof consists of some 32 tons of seaweed (or eelgrass, as the case may be). We chatted to a representative of Adam Schnack, who is selling the home, and were told that it should offer very good insulation and last about 50 years.

The one-level home spans 1,076 square feet. It's listed for sale with a price of $415,000.

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