Guided walking tours are one of the best introductions to a city. But few travelers realize that a growing number are offered for free — or on a pay-what-you-want basis. Happy with the tour? Then just tip the guide.
Here are 10 great tours across the U.S. that will have you reaching for your wallet.
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Award-winning travel writer Veronica Stoddart is the former travel editor of USA Today. She has written for dozens of travel publications and websites.