5Santorini, Greece

Santorini is famous for its white-washed buildings, blue-domed churches, and stunning sunsets. However, this small island has struggled to cope with the sheer number of tourists it attracts.

Overcrowding has put a strain on the island’s infrastructure, and the government has introduced measures to limit the number of daily visitors. The goal is to protect the island’s natural beauty and ensure it remains a sustainable destination for both residents and future visitors.