There's a thermal river carved into a canyon in Mexico that Instagram almost destroyed. Here's why it survived — and why you should still go. They almost found it. Not long ago, Tolantongo was the kind of place that only the people who knew someone who knew someone ever visited. A thermal river carved into a canyon in the mountains of Hidalgo, three hours north of Mexico City, where water comes out of the earth at 104 degrees Fahrenheit and turns the river turquoise. Then I