This summer, American tourists are making quite a splash across Europe, with a notable increase in their numbers. The trend is soaring, with a projected 24 million trips from the U.S. to the European continent in 2025. Some countries are feeling the love more than others, with Portugal and Greece experiencing the largest percentage hike in U.S. visitors in the last decade. Meanwhile, the United Kingdom and Italy are basking in the glow of more American tourists overall—if you just look past those road trips to Mexico and Canada.

So what’s fueling this travel frenzy? Well, it appears that a combination of wealthy baby boomers and adventure-seeking millennials, often dubbed “frenziers,” are the catalysts behind this significant shift. Thanks to a robust U.S. economy, a growing number of Americans now view travel as essential, rather than just a nice-to-have activity. This wealthy cohort, holding an astounding $110 trillion in wealth, is living longer and keen on making the most out of their golden years. At the same time, the younger generations are prioritizing experiences over material possessions like homes or children, leading them to jet off to far-flung destinations.

However, the increasing number of American tourists isn’t all sunshine and rainbows for Europe’s locals. While Americans bring a boost in cash flow, local economies are finding it a bit of a double-edged sword. The sudden influx can strain existing infrastructure and has even started to push up the cost of living. This means housing—especially for local residents—has become scarce and unaffordable, as more apartments are being converted into high-priced short-term vacation rentals.

As cities grapple with the impact of this rising tide of visitors, some governments have begun to impose limits on tourism. It’s a tough situation, as catching tourists’ attention is still crucial for many businesses that thrive on the spending power of American travelers. These are the folks who not only spend generously but also tend to linger longer than average tourists.

So, what does this all mean for the future of travel in Europe? As more Americans pack their bags and head across the Atlantic, local governments will have to balance attracting tourists with preserving the charm of their communities. It’s a tricky dance between welcoming visitors and keeping neighborhoods livable for those who call these beautiful cities home. In the end, whether it’s sipping espresso in a quaint Italian café or lounging on a sun-soaked beach in Portugal, the magic of travel continues to draw Americans abroad, proving that adventure truly knows no bounds.