Sky History 2 HD Wednesday

A look at the 1974 Coyame and 2007 Xilitla UFO crash cases in Mexico, where the Mexican and US military reportedly recovered wreckage material

The world's top 10 pyramid sites, from a valley in Peru with over 250 hidden pyramids to an ancient Greek city with mysterious 4,800-year-old ruins to Egypt's famous Giza Plateau

The world's top 10 mysterious devices, from strange, grooved disks found in a cave in China to an ancient Greek computer to an incredible crystal skull unearthed in Mexico

The world's top 10 mysterious islands, including remote landmasses that are home to massive megalithic structures and islands that 'disappear' into thin air

The top 10 alien craft, from V-shaped objects to orbs of light to flying saucers

Hindu god Shiva, the great destroyer. This programme contemplates whether the deity could have been the leader of an extraterrestrial race