TV Guide for Today Tuesday 25 in Sky History 2

Experts scrutinise the engineering behind the Egyptians' Sphinx and pyramids. Could this advanced civilisation have received extra-terrestrial help.

A newly discovered town in Devon turns history on its head and there's a shocking find by the Thames - almost 100 baby skeletons.

Dr Alice Roberts visits excavations in Orkney and York on the hunt for Viking relics. Finds include an amazing collection of silver and gold.

Dr Alice Roberts discovers what Britain was like before the Romans as she examines fascinating finds from the Bronze and Iron Ages.

Dermot Murnaghan examines the tragic case of five-year-old April Jones, who was abducted and killed by 46-year-old Mark Bridger in October 2012.

A look at cases where people have claimed strange voices urged them to commit horrific deeds. Could they have been obeying the orders of aliens.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.

What lies beneath? David Duchovny takes us into the top-secret government bases and the clandestine operations they were built to conceal.

Military historian Stephen Bull tests the three most significant weapons of the sea and explores whether the subsonic torpedo could rule the waves in the future.

Drug dealer Dale Cregan hit the headlines in 2012 when he murdered police officers Nicola Hughes and Fiona Bone. Dermot Murnaghan examines the tragic case.

A look at cases where people have claimed strange voices urged them to commit horrific deeds. Could they have been obeying the orders of aliens.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.

Sharp Top Mountain B-25 Crash: Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew.

Explore the complex case of the death of Wladyslaw Sikorski, the Polish PM whose plane crashed soon after taking off in 1943.

Australia's Worst Crash: Australia's worst aviation accident happened in 1943 when 40 crew died in a B-17 bomber crash.

Death in the Moonlight: In 1944, two Wellington bombers collided in mid-air over Northants. Garth Barnard investigates why 13 young trainees perished.

Death on the Great Plains: Garth Barnard fact-finds to determine the cause of a terrible accident in Nebraska in 1944, when a plane crashed during a violent storm.

Take a closer look at the working conditions of a miner in Indonesia, visit the Petrifying Well in England and tour a village where the houses are simply holes in the ground.

Few have ever heard of the top-secret base in the deserts of Utah known as Area 52, but reports of UFOs have convinced people that the US military is keeping secrets.

Military historian Stephen Bull tests the three most significant weapons of the sea and explores whether the subsonic torpedo could rule the waves in the future.

An exploration into the dark art of spy-craft reveals the deadliest weapons deployed to gather information and assassinate enemies.

Venture into the unknown stories of the American frontier and the anonymous Black figures that have inspired countless Hollywood tales, yet have been erased from the silver screen.

A look at cases where people have claimed strange voices urged them to commit horrific deeds. Could they have been obeying the orders of aliens.

Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help.

Few have ever heard of the top-secret base in the deserts of Utah known as Area 52, but reports of UFOs have convinced people that the US military is keeping secrets.

Sharp Top Mountain B-25 Crash: Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew.

Explore the complex case of the death of Wladyslaw Sikorski, the Polish PM whose plane crashed soon after taking off in 1943.