The Radar: Great London Walking Tours, Chicago’s Chocolate Exhibit, Holiday Flight Deals

• Leave your guidebooks at home and take part in one of London’s great walking tours. With themes ranging from Harry Potter to street art, there’s a tour for everyone. [The Guardian]

• Give in to your sweet tooth at Chicago’s Field’s Museum this fall. The museum exhibit “Chocolate: Around the World” is returning to Chicago through January 8. [Jaunted]

• Don’t let expensive flights ruin your holiday travel plans. Tips from USA Today’s airfare expert Rick Seaney can help you get the best deals. [USA Today]

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Photo: Connor Burns/ My Shot