MrBeast is only 26 years old, but he is the most successful YouTuber in the world, having reached 320 million subscribers on his channel.
His real name is James Stephen Donaldson, and this summer he spent 7 days at Salina Turda in Cluj, alongside other famous online creators.
On Saturday night, he posted the video made here, which garnered over 27 million views within 16 hours of being published.
In the video, the young vlogger talks about the Transylvanian salt mine as one of the most spectacular tourist attractions in the world, presenting it as "an underground city."
During each of the 7 days he spent in the salt mine, MrBeast had a different famous YouTuber as a guest.
The video is titled "7 Days of Exploring an Underground City" and is 20 minutes long.
"This city is built inside a mine that dates back over a thousand years. With countless unexplored tunnels and rooms, who knows what horrors we will encounter.
These are the stairs leading down into the city. How old are these stairs? Older than us.
Okay, now that we're down here, look how high the ceiling is. Wow.
During World War II, when Romania was bombed, thousands of people hid here, and now only a bunch of YouTubers live here," MrBeast amusingly recounted.
The vlogger also posted a photo on his Instagram account, where he has 60 million followers (photo above).
In the photo from the salt mine, he is with the other YouTubers.
In the background, the tourist promotion logo of Romania can be seen.
Alongside the photo, he writes: "It's one of the funniest videos I've made in a while :)."
MrBeast has an estimated fortune of around 1 billion dollars, with the majority of his money coming from YouTube, where viral videos bring him huge sums from ads and brand partnerships.
However, he also has a line of merchandise and various profitable businesses, such as the Feastables food brand and the MrBeast Burger fast-food chain.
What sets him apart from other vloggers is that a significant portion of the money he earns is spent on charitable purposes.
He started posting on YouTube in 2012 at the age of 14, but he became famous in 2017 when he began engaging in charitable acts.
Among other things, he has donated tens of thousands of dollars to homeless people, in some videos he offers houses, cars, or huge sums of money.
A notable example is building houses and schools in Africa. Additionally, he has helped sick individuals cover the costs of very expensive surgeries.