Over-tourism continues to be a topic in many popular world destinations. Amsterdam has now put a halt to all new hotel building. Venice continues to charge entrance fees, and now, Barcelona is targeting the rental apartment and Airbnb market. CBS News travel editor Peter Greenberg has more.

<p>Over-tourism continues to be a topic in many popular world destinations. Amsterdam has now put a halt to all new hotel building. Venice continues to charge entrance fees, and now, Barcelona is targeting the rental apartment and Airbnb market. CBS News travel editor Peter Greenberg has more.</p>

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