Sky History 2 Monday

A look at perplexing and unusual objects lying hidden away in museums, laboratories and storage rooms

A trip to Harvard University's Warren Anatomical Museum, where one of the displays is the shattered skull of a 19th-century American railway worker

Strange markings in the remote reaches of Northern Finland, a Manhattan-sized mystery in the depths of a Vietnamese cave and a lost sky-high world in Mozambique

Veterans and historians tell the story of the Thai-Burma railway and the countless prisoners of war and slave labourers who died building it

From the trench to the home-front hospital, a medical historian retraces the train journey made by wounded soldiers during the Second World War

Experts investigate ancient man's apparent obsession with building pyramids, and consider whether extraterrestrials may have helped with their construction

Ancient alien therorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind

Experts investigate why so many UFO sightings take place in Los Angeles, and believe the answer may lie underwater

Alice Roberts explores Plymouth's history during the Elizabethan era, visiting the home of Sir Francis Drake, and uncovering his history of piracy and slave trading

Professor Alice Roberts is in Glasgow to investigate the impact of steam power on major towns in the 18th and 19th centuries, and learns about the arrival of migrant workers

A look at perplexing and unusual objects lying hidden away in museums, laboratories and storage rooms

A trip to Harvard University's Warren Anatomical Museum, where one of the displays is the shattered skull of a 19th-century American railway worker

Strange markings in the remote reaches of Northern Finland, a Manhattan-sized mystery in the depths of a Vietnamese cave and a lost sky-high world in Mozambique

Veterans and historians tell the story of the Thai-Burma railway and the countless prisoners of war and slave labourers who died building it

From the trench to the home-front hospital, a medical historian retraces the train journey made by wounded soldiers during the Second World War

The notorious Los Angeles-originated gang known as MS-13, and the battle faced by law enforcement agencies as it attempts to extend its sphere of influence

The Bloods and their relentless fight against arch-nemesis, the Crips. As tensions escalated, the conflict illustrated the lengths they would go to defend territory and reputation

Former Hells Angels Presidents provide first-hand insights into Sonny Barger, the commander of the world's most infamous biker gang

Experts investigate ancient man's apparent obsession with building pyramids, and consider whether extraterrestrials may have helped with their construction

Ancient alien therorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind

Experts investigate why so many UFO sightings take place in Los Angeles, and believe the answer may lie underwater