| In case you missed it this week: A quiz on tipping while traveling; travelers confessing crimes; and photos from the least-visited national park. | (Illustration by Enisaurus for The Washington Post) Do you know how to tip? Take this quiz to find out. Test your knowledge on tipping in America while traveling with our interactive quiz. Plus, read here on the best ways to tip when you don't have cash. | (Illustration by Heidi Berton for The Washington Post) Why it's so hard to find a power outlet at the airportEver unpack all your devices, plug in and notice you don't have power? You're not alone. | (iStock/Washington Post illustration) Travelers are confessing to using fake vaccine cards to their travel advisersPeople are telling their travel advisers about more than what trips they want to take. They're admitting to crimes. | (Marlena Sloss for The Washington Post) 10 days in 8.4 million acres: A trip to the least-visited national parkAn Alaskan-born photographer returned home for a family trip and solitude in Gates of the Arctic. | More from The Washington Post | (Shutterstock) She finally got to the Southwest's most-photographed slot canyon. And it left her speechless.Arizona's spectacular Upper Antelope Canyon, which reopened to the public this summer, attracts photographers from around the world. | Explore BTW's guidesThere's more to see | (Dennis M. Rivera Pichardo for The Washington Post) | Travel is back, and we are updating our City Guides to 70 cities around the world so you can plan your dream trip. This week, check out our guide to San Juan, Puerto Rico. | | Croatia is known for its picturesque coastline and ancient walled cities, but on the Istria peninsula, a variety of historic influences meld into a beautiful present. Ruled at times by the Venetians, Romans, Byzantines, Slavs and Austrians, Istria is rich in history and elaborate architecture. But it also has a distinctive culture apparent in everything, including the food, the wine, and the extremely friendly and welcoming people. Read more on this charming Mediterranean region from writer Anna Mazurek. | |