https://www.livescience.com/old-faithful-black-hole.html
Monster black hole spews energy as regularly as Yellowstone's 'Old Faithful' | Live Science
Jan 20, 2021 - Regular energy flares that emerge from galaxy ESO 253-3 are produced by a black hole about 20 times larger than the one at the center of the Milky Way.
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https://wakeupwyo.com/watch-old-faithful-live-cam-247/
Watch 24/7 Old Faithful Live Cam
During the day you can watch the park, look for stupid tourists trying to get themselves killed, and see Old Faithful erupt every 90 minutes or so.
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