It happened around 3:30 p.m. Saturday at the Wantagh Preservation Society and Museum.
The Chamber of Commerce was holding its annual Winter Wonderland Holiday Fair when someone noticed smoke coming from the roof.
Firefighters arrived and put out a small fire near the chimney.
No one was injured and firefighters removed some historical artifacts from the building to keep them safe.
The Nassau County Fire Marshal is investigating but the fire is not considered to be suspicious.
ALSO READ | Surveillance video shows car fly down Brooklyn sidewalk
Video shows car fly down Brooklyn sidewalk before crashing into pharmacy
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a tip or story idea to Eyewitness News
Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.