Unesco has warned Peru that the Inca citadel of Machu
Picchu might lose its world heritage status if they do not
act to protect it. Every year, hundreds of thousands of
people visit Machu Picchu. Experts say unrestricted tourism
and landslides have damaged the 15th Century citadel and
the nearby Inca trail that leads to it. In response, the
Peruvian authorities have submitted a 400-page report $130m
plan to the UN’s cultural arm which is believed to include
satellite monitoring to measure earth movements and a daily
limit of 2,500 tourists, to preserve the site.