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 islandโ€™s natural beauty and ensure it remains a sustainable destination for both residents and future visitors.