Watch: Sonoma man finds fire burning INSIDE tree

In the swathe of destruction left by the wildfires burning in Sonoma and Napa counties, people have come upon some strange sights.

Cars flipped upside-down by their exploding gas tanks. Homes left untouched in city blocks where every other house was leveled. Even a boiling stream of wine.

But none was weirder than what Matthew McDermott spotted on Monday as he drove through Wine Country.

McDermott was scouting for escape routes from his home town of Sonoma, which was slowly being encircled by the wildfires. He was near the town of Schellville when he glimpsed a tree that was burning from the inside out.

He could see the flames through gaps in the trunk as fire roared up its hollowed-out length.

"I've definitely not seen anything like this before," McDermott told CNN. "We wanted to know the escape routes in case we needed them. The route to Poloma was open. I just stopped on the side of the road and the whole ridge is on fire."

Check out McDermott's video.