A new nationwide interactive map documents the last known location of people who have gone missing in the last 50 years.

Beneath the turquoise waters of the South Pacific hides a massive secret—Zealandia, a sunken landmass stretching nearly two ...

As long as people have been visiting the Great Barrier Reef, they've been obsessed with it. Under the shimmering turquoise waters of Australia's east coast is a labyrinth of alien-like formations ...