These huge stone statues are at Rapa Nui, or Easter Island. This Chilean island lies 3,500 kilometers (almost 2,200 miles) west of the mainland, deep in the Pacific Ocean. The island is one of many places worldwide that are vulnerable to sea-level rise.

A child buried in a fifth century Roman cemetery had a stone placed in his or her mouth. The stone was part of a funeral ritual to keep the body from coming back to life, scientists say.

Colossal stone headgear placed atop some Easter Island statues may have been rolled up earthen ramps. Small groups of people could have moved them using only long ropes, a new analysis suggests.

The Great Pyramid of Giza, the largest of the Egyptian pyramids and the last remaining ancient wonder of the world, contains a large, previously undiscovered void, researchers now report.