The Observer view on overtourism: sometimes, the planet’s hotspots are best left unvisited

From Everest to Machu Picchu, we can't get enough of those must-see' places. It's time to show some restraint

Climbing Everest used to be an even more dangerous pursuit than it is today, requiring huge bravery, endurance and skill. Even then the mountain could kill. A century ago, it claimed the lives of two of Britain's finest climbers, George Mallory and Sandy Irvine.

The world's highest mountain eventually succumbed to human challenge when, almost three decades later, Edmund Hillary and Tenzing Norgay carried the flags of Britain, the UN, and Nepal to its summit on 29 May 1953. Sporadic trips involving handfuls of explorers continued over succeeding years.