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An extension is now underway to get people into the centre of Australia's biggest city, including a new tunnel crossing deep under Sydney Harbour.

We go back under Sydney Harbour to check out history in the making as the construction of the twin metro rail tunnels continues deep under the surface.

Guided by his Bradshaw's 1913 Handbook of Indian, Foreign and Colonial Travel, Michael Portillo embarks on a rail journey from Amritsar to Shimla.

Michael Portillo travels from Jodhpur to Delhi, heading into the desert to take a camel ride to a village where life has changed little in centuries.

Michael Portillo travels from Mysuru to the first stronghold of the East India Company in Chennai.

As Robbie leaves the scenic Llangollen Canal, he faces a journey of running repairs and narrowboat maintenance on the old Naughty Lass.

With the Anderton Boat Lift out of action, Robbie explores the scenic River Weaver onboard a borrowed narrowboat called 'Tench'.

Robbie navigates the Oxford Canal, bumps into a hire boat and a hedge and tackles large river locks on the scenic Upper River Thames.

Simon Reeve travels along the Yangtze in China, seeing ancient rock carvings and the biggest power station on the planet before arriving in Shanghai.

Simon Reeve travels through Cornwall as the county emerges from the first Covid-19 lockdown and discovers the impact of the disease on its tourist industry.

Simon Reeve investigates the environmental challenges facing Cornwall and the rest of the country and also encounters some of the county's iconic wildlife.

Robbie returns to where his boating life began, exploring London's canals on Naughty Lass. He travels through Little Venice and moors in Paddington Basin.

As Robbie leaves the scenic Llangollen Canal, he faces a journey of running repairs and narrowboat maintenance on the old Naughty Lass.

With the Anderton Boat Lift out of action, Robbie explores the scenic River Weaver onboard a borrowed narrowboat called 'Tench'.

As a teenager, all Dave wanted for his first car was a 2 litre Ghia Cortina, and today he's off to Nottinghamshire to collect just that, alongside a Mark 1 Capri.

Paul and daughter Kate collect a Series 1 Land Rover, while Jack collects an unusual wartime paratrooper's bike in Scarborough.

The guys are drawn by the curves of a stunning 1999 Morgan with an incredible 4.6 V8 engine, but things aren't as good as they seem when they get to the garage.