Planeta inexplicable

The cause behind the shimmering blue waves off the coast of Australia is uncovered. Then, Australia's Karijini gorges are some of the oldest in existence, and a volcanic region of Iceland has bubbling potholes that create an otherworldly atmosphere.

A professor shares fascinating new discoveries surrounding an ancient monument, the Giant's Causeway, in Northern Ireland. Then, a busy, modern metropolis collides with ancient archaeological evidence at Los Angeles' La Brea Tar Pits.

We get a closer look at geysers at a US national park and a geothermal field in Iceland. Then, a stack of pancake-shaped rock formations bewilders passersby in New Zealand, and approximately 50 million crabs journey across Christmas Island, Australia.