Season 4

Get a birds-eye view of a mysterious, massive explosion in China and a quickly melting glacier on Earths iciest continent; investigate a strange orange haze enveloping the Big Apple, then float over a toxic, too-hot-to-handle lake in New Zealand.

Revealed from above; mysterious holes in Isreal; a ghost village hidden in the Colombian jungle; a shipwreck off the coast of Sri Lanka; and a gutted airplane fuselage abandoned in Iceland.

Investigate an abandoned village in the shifting sands on Dubai's outskirts and a collection of inexplicable stone circles in Colombia; a mysterious hilltop tower in Iran and a puzzling purple phenomenon in Chile's Atacama Desert.

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