The treasure has been right before our eyes all these years, buried among the ruins of Detroit.

Chris Christoff and Alexandra Mondalek of Bloomberg news report that recyclers find treasures galore in abandoned homes. 

Detroit’s 70,000 abandoned homes are proving to be a trove for entrepreneurs who recycle century-old lumber, glass and brick into everything from terrariums to $4,500 guitars.

“It’s like a treasure hunt,” said Craig Varterian, executive director of Reclaim Detroit, a nonprofit group that’s stripped and sold materials from almost 70 demolished homes. Floorboards and joists of early 20th century maple, walnut, hickory, fir and even chestnut are valued for their density and fine grain.

As Detroit ramps up demolitions of vacant dwellings, Mayor Mike Duggan plans a reclamation center in a city-owned building to keep tons of rubble out of landfills and create jobs and merchandise. Recycling would become a centerpiece of the city’s blight-removal effort, which is struggling to maintain funding.

Read more: Bloomberg Business