Investigating significant historic and contemporary sites from the revealing vantage points of drone, satellite, and aerial photography.
See a giant glacier on Mars, milky seas near Java, a hexagon over Saturn and a doughnut-shaped lake in Saskatchewan. (S3, ep 1)
Explore strongholds abandoned by their architects, look at a lost city in the Amazon jungle and see a desert fortress made by humanity's most notorious empire. (S3, ep 2)
Fly over an imperial pyramid in the Netherlands, a metal sphere in Russia, a lion in England and a swath in an Austrian forest. (S3, ep 3)
Discover familiar stone monoliths in Colombia, explore a lost city in Sierra Nevada and unravel ancient ruins in Greece and Malta. (S3, ep 4)
Face bizarre sights: a spinning island in Argentina, a desert triangle, Ethiopia's colourful pools and a giant figure in Australia's outback. (S3, ep 5)
Dive into mystery: a sunken Italian city, a Keys underwater cemetery, a South Pacific yellow brick road and strange rocks off Australia. (S3, ep 6)
Explore a psychedelic swirl in the Utah wastelands, a bizarre configuration of circles in the Sahara and a remote polka-dot lake in Canada. (S3, ep 7)
Fly over metropolises, discovering an important urban centre that is sinking, ruins buried under the desert and a ghost town on the edge of the Gobi Desert. (S3, ep 8)
Look inside curious dwellings in the Peruvian Andes, visit a sacred monolith in Wyoming's Black Hills and spot an immovable waterfall in Mexico. (S3, ep 9)
Experience stunning animal spectacles: soaring over northern nomads, Pacific giants, a US pig stampede and fierce ocean predators. (S3, ep 10)