"Mass tourism can be roughly defined as thousands of people going to the same destination, often at the same time of the year, and often arriving in large, consecutive human waves. Examples of these human waves of tourism include, but are not limited to those times when enormous cruise ships dock and disembark or when weekly turnover occurs at area wide lodging and vacation rentals.

Among the factors that have accelerated the impacts of mass tourism in recent years are:

• Airbnb, VRBO, and similar websites which allow for homeowners to easily rent rooms or dwellings – this can balloon the number of visitors well beyond traditional lodging
• Larger and more numerous cruise ships (for oceanfront locations)
• Advent of deep discount and no-frill airlines making air travel more affordable
• Second, third, or fourth vacation homes for the wealthy
• Investor-scale buying of residential properties and converting them into vacation rentals"

https://panethos.wordpress.com/2017/02/03/the-venice-effect-destination-cities-imperiled-by-mass-tourism/