U and Eden+1

Sir David Attenborough shares secrets of the natural world. Here he looks at the wood frog and the emperor penguin.

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The Royal Palace of Caserta near Naples, Italy, which was created by Luigi Vanvitelli and houses a silk factory that dates back to the 18th century.

Kensington Palace, which began life as an early 17th-century Jacobean mansion before becoming a palace fit for the monarchy, and was the brainchild of Christopher Wren.

Tim heads north of the border to scale a Scottish railway icon - the Forth Bridge, without doubt one of the engineering wonders of the world.

Tim Dunn discovers how railway architecture has been repurposed. He starts with Manchester's Castlefield area, where viaducts still dominate the cityscape.

Tim explores the Channel Tunnel, stopping off at Ashford International to take in this underappreciated piece of 90s railway architecture.

Tim Dunn gets to grips with his local station - London Bridge, meeting the architects who turned this station into a bright, airy and tranquil modern terminus.

The Royal Palace of Caserta near Naples, Italy, which was created by Luigi Vanvitelli and houses a silk factory that dates back to the 18th century.

Kensington Palace, which began life as an early 17th-century Jacobean mansion before becoming a palace fit for the monarchy, and was the brainchild of Christopher Wren.

Tim heads north of the border to scale a Scottish railway icon - the Forth Bridge, without doubt one of the engineering wonders of the world.

Tim Dunn discovers how railway architecture has been repurposed. He starts with Manchester's Castlefield area, where viaducts still dominate the cityscape.

Tim explores the Channel Tunnel, stopping off at Ashford International to take in this underappreciated piece of 90s railway architecture.

Tim Dunn gets to grips with his local station - London Bridge, meeting the architects who turned this station into a bright, airy and tranquil modern terminus.

For the first time in 50 years, the Airfix team attempt a 1:24 scale kit of a Spitfire. Will designer Chris be able to capture the iconic warbird in sufficient detail.

Simon and Montana attempt the hard sell at The Dorset Steam Fair, whilst designer Steve takes on the challenge of replicating one of the world's newest trains.