Visitors at Mammoth Cave National Park had an interesting sight this weekend.
Park officials said fog filled the popular Rotunda room on Sunday due to a storm system that moved through the park.
"Today we had a large and unexpected storm come through the park which caused a quick drop in the temperature," a post from the park said on Facebook. "This pressure change caused the airflow to reverse, pulling into the cave, resulting in a dense fog filling the Rotunda room."
Park officials said the phenomenon occurs infrequently and "only with the perfect conditions."
"That is not fog. That is clearly a portal to another world," one commenter on Facebook said.
Despite outside temperatures, the cave’s temperature averages a cool 54 degrees year-round.
The Rotunda, where the fog formed over the weekend, is one of the most visited areas in the cave, parks officials said.
The large circular room is the sixth-largest room of the cave and is about a quarter-acre in size. It measures 140 feet wide and about 40 feet from floor to ceiling.
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