Disaster struck in 1875 when fire destroyed some of the original buildings, including the large rotunda that gave the Round Foundry its name. Some buildings were saved, the earliest of which dates from 1798.
The fire that ravaged the Round Foundry in 1875 caused significant damage, particularly to the rotunda, which was instrumental in defining the foundry's identity.  However, some structures dating back to 1798 remain, offering a glimpse into its historical development and resilience.