MADRID (AP) — Suitcases rattle against cobblestones. Selfie-snappers jostle for the same shot. Ice cream shops are everywhere. Europe has been called the world’s museum, but its record numbers of visitors have also made it ground zero for concerns about overtourism.

Last year, 747 million international travelers visited the continent, far outnumbering any other region in the world, according to the U.N.'s World Tourism Barometer. Southern and Western Europe welcomed more than 70% of them.

As the growing tide of travelers strains housing, water and the most Instagrammable hotspots in the region, protests and measures to lessen the effects of overtourism have proliferated.

Here’s a look at the issue in some of Europe’s most visited destinations.

What’s causing overtourism

Among factors driving the record numbers are cheap flights, social media, the ease of travel planning using artificial intelligence and what U.N. tourism officials call a strong economic outlook for many rich countries that send tourists despite some geopolitical and economic tensions.

In some of Europe's most-visited destinations, tourists often outnumber the country's population

Citizens of countries like the U.S., Japan, China and the U.K. generate the most international trips, especially to popular destinations, such as Barcelona in Spain and Venice in Italy. They swarm these places seasonally, creating uneven demand for housing and resources such as water.

Credit: APNews.com