The Radar: 50 Free European Activites, National Park Adventures, One-Tank Road Trips

• How can you avoid paying nearly 25 dollars to visit London’s Westminster Abbey? Wait until evening. At 5 p.m, the Abbey’s choir sings their nightly ‘Evensong,’ a performance that is open and free to the public. Discover more insider tips with Hostel World’s guide to 50 free things to do in Europe. [Hostel World]

• Rock climbing, whitewater rafting, and volcano trekking. Get your adventure on at one of these ten national parks. [USAToday Travel]

• Want to take a road trip this summer but dread the cost of filling up your gas tank? Here are five one-tank trips around the U.S. that will let you experience the great American road trip without breaking your budget. [CNN]

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Photo: Emily Jewer/My Shot