This list from Guru Walks is not comprehensive since it only has data on destinations where that company operates, but if you’re looking for good walking cities, it’ll give you plenty of ideas. All of the top 30 are in Europe except for Marrakech, but then comes more variety with New York City, Tokyo, Mexico City, Medellin, Hanoi, Cartagena, Buenos Aires, and Cusco making a showing.

Historical Tech Tree

Want to find out when something was invented and what else arrived around the same time? Check out the Historical Tech Tree that lays it all out on a timeline. In case you were wondering, sunglasses have been around since 1750, wristwatches since 1810, and flashlights since 1899. (Suitcases and backpacks not listed, though the upright rollaboard suitcase didn’t appear until 1987.)

United Partners With JetBlue and Spotify

If you’re sitting on a lot of JetBlue points, you may want to hold onto them for a while because United and JetBlue are partnering up. Dates are fuzzy but at some point you’ll be able to use JetBlue miles to book a United flight and vice-versa. It’ll also mean more slots for United planes at JFK. Also, the United flight I was just on had some Spotify podcasts and the choices are going to expand to music and audiobooks under a new agreement.

Lifetime National Park Pass for Seniors

I visited Joshua Tree National Park last week and would highly recommend a visit if you’re anywhere near there. When I’m old enough I plan to pick up one of the greatest travel bargains on the planet: a lifetime U.S. National Parks pass for only $80. If you’re a citizen or legal resident 62 or older, buy it online here and wave it at entrance gates for the rest of your life.

A weekly newsletter with four quick bites, edited by Tim Leffel, author of A Better Life for Half the Price and The World’s Cheapest Destinations. See past editions here, where your like-minded friends can subscribe and join you.