2. The Colosseum, Rome, Italy
Rome’s Colosseum is a must-see, but its popularity has made it a prime example of overtourism. With up to 7 million visitors annually, the once-gladiatorial arena now feels more like a shopping mall than a historic monument.
The large crowds can detract from the experience, with limited space to take in its grandeur. Booking tickets in advance or visiting off-peak hours are a few ways to escape the rush and get a more peaceful experience.