Travelers wanting a glimpse of Peru's famed Machu Picchu will be restricted to visiting during morning or afternoon tours in a move aimed at conserving the site's archaeological splendor.

The new rules go into effect in July and will allow about 3,600 visitors to enter the ancient Incan citadel from 6 a.m. to noon and an additional nearly 2,700 people to explore during the afternoon.

Previously, travelers could spend the entire day taking in the world-renowned site.

The changes are a result of a 2015 study by a U.S. archaeologist and recommendations from UNESCO on how best to ensure that Machu Picchu isn't hurt by rising numbers of tourists.

Visitors will also be required to use a guide-led tour.