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A shocking look behind the bars of six of America's toughest, meanest and most daunting jails.

Wayne County Jail, Detroit, is targeting habitual femail offenders, for help, not punishment.

Discover how weapons have been used to smash skulls for centuries in Skull Smashers.

A fascinating look at the evolution of aerial combat from fighter tactics to the use of the plane as an 'eye in the sky'.

The jet engine led to revolutionary changes in aerial combat but huge risks were taken by designers, pilots and air crews in...

We go under the radar of the F-22 Raptor, the world's latest war plane, which can break the sound barrier and is almost...

Dominating the skyline of Granada in Southern Spain, The Alhambra is an architectural wonder born from battle between Muslims...

Discover the secrets of the Alhambra’s defences and explore the watchtower – the anchor for the planned Muslim fortress.

There was more to the Alhambra than a fortress – it was also designed with Palaces and peaceful gardens in mind. Discover...

Petra is one of the world’s most mysterious ancient cities with the Al Khazneh building at its entrance an engineering...

Discover how the Nabutian builders of Petra transported water through the scorching desert using terracotta pipes, and...

Find out about the constructional engineering that went in to building Al Khazneh, which is integrated into the rock face.

The ancient lost city of Petra is a magnificent sight – find out how it was discovered in the eighteenth century and why it...

When the Great Fire of 1666 destroyed St. Paul’s Cathedral in London, a Royal Commission turn to 35-year old astronomer,...

The most iconic element of St Paul’s is the mighty dome of St Paul’s, topped by a gold cross 111 metres above the ground....