9. Sibley Breaker, Pennsylvania

Built In 1886 And Destroyed By Fire In 1906
A colossal coal-processing facility, this breaker crushed and sorted anthracite, embodying the industrial might of Pennsylvania’s mining era. It employed thousands in grueling conditions.
A fire razed it exactly two decades after construction, highlighting the dangers of the industry, including child labor. Its legacy endures through the World Forestry Center, which echoes its historical significance in a new form.