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This careful process of removing soil layer by layer allows archaeologists to uncover artifacts without damaging them or losing contextual information.
Difficulty: EasyThis massive canal system at Angkor, recently mapped by LiDAR, supplied water to nearly a million people and may have failed due to climate change.
Difficulty: MediumThis 17th-century English ship, wrecked near the Isles of Scilly in 1707 with Admiral Sir Cloudesley Shovell aboard, carried naval payroll that remains largely unfound.
Difficulty: HardThis method of dating archaeological sites uses the known pattern of annual growth rings in trees to establish precise calendar dates.
Difficulty: MediumThis technique analyzes ancient DNA from bones and teeth to determine migration patterns and population relationships in lost civilizations.
Difficulty: HardThis legendary city of gold was sought by Spanish conquistadors throughout South America, but was never found.
Difficulty: EasyThis formal model predicts that foragers should leave a resource patch when the marginal return rate drops to the average for the environment.
Difficulty: HardThis ancient Incan city sits high in the Peruvian Andes and was never found by Spanish conquistadors.
Difficulty: Easy