7. Machu Picchu, Peru
The ancient Inca city of Machu Picchu is one of the world’s most spectacular archaeological sites, but its overwhelming popularity has made it a victim of overtourism.
Despite efforts to limit visitor numbers, the crowds can still be significant, with long waits and narrow walkways leading to a cramped experience. For a more tranquil visit, opt for an early morning trek or a less-frequented hiking route.