I just got back from Mexico City, which tourists usually avoid because they don't feel safe there. It's a shame, too. Mexico City is awesome -- and can be safe.

Three years ago, I wrote a piece here called "Digital nomad survival tips you can use anywhere." The column was based on everything I had learned (often the hard way) about how to stay safe while living and traveling abroad since 2006.

In the past three years, however, new tech has emerged that enhances safety even further. And I've learned a few new tricks as well.

Here are my best, most surprising new ideas about how to travel while protecting your money, property, health and life.