Visit the Chauchilla Cemetery

Watch the sun rise along the Thirteen Towers of Chankillo, a 2,300-year-old solar calendar in the desert

Walk the ghost settlement of Santa Bárbara, the colonial mercury mine they called 'the mine of death'

Ruined British slave fort on an island in the Sierra Leone River, from which thousands were shipped to the Carolinas.

Explore the underground ossuaries in Paris, holding the remains of more than six million people

A chapel decorated with the bones of 40,000 people — chandelier included — beside the Gothic St Barbara’s Cathedral.

Set eyes on Río Abiseo, the UNESCO park almost nobody may enter — cloud-forest ruins and a monkey back from the dead

Stand among the cloud-wrapped ruins of Machu Picchu, the 15th-century Inca citadel perched high above Peru's Sacred Valley

Walk among the 5,000-year-old pyramids of Caral, the oldest known city in the Americas