TV Guide 5SELECT Saturday

Engineer Rob Bell offers an insight into the history, design and building process of the Britannia Bridge, across the Menai Strait between the island of Anglesey and the mainland of Wales

Sleuth Jessica Fletcher heads to Ireland for the reading of an old friend's will, but is intrigued to find it contains a series of cryptic clues. Certain they point to hidden treasure, and are in some way linked to a spate of unexplained deaths, she enlists the help of the deceased's family to solve the puzzle. Mystery, starring Angela Lansbury, Fionnula Flanagan, Sarah-Jane Potts and Peter Donat

Sleuth Jessica Fletcher heads to Ireland for the reading of an old friend's will, but is intrigued to find it contains a series of cryptic clues. Certain they point to hidden treasure, and are in some way linked to a spate of unexplained deaths, she enlists the help of the deceased's family to solve the puzzle. Mystery, starring Angela Lansbury, Fionnula Flanagan, Sarah-Jane Potts and Peter Donat

Cabot Cove's new physical fitness instructor is accused of murdering a con-artist interested in property, presenting Jessica with a fresh mystery to solve. Angela Lansbury stars

Jessica discovers her former boss, who was previously jailed for murder, is in the dock again, accused of stabbing a man to death. His passionate pleas of innocence convince her he could be telling the truth, so she resolves to get to the bottom of the matter. Guest starring Spinal Tap's Michael McKean

A book expert discovers that a Mark Twain manuscript has gone missing, which proves to be only the first chapter in a story of forgery, arson and murder. Angela Lansbury stars as the amateur sleuth

Jessica takes a break from her home town of Cabot Cove to pay a visit to a country music star - but before long a simmering feud leads to murder. Angela Lansbury stars

Jessica helps reformed jewel thief Dennis Stanton investigate a fire that has burned the hands of a famous concert pianist, uncovering a tangled tale of arson, fraud and unrequited love. Starring Angela Lansbury and Ricardo Montalban

Jessica and old friend Dr Seth Hazlitt are kidnapped by the vengeful son of a mobster who died of his wounds while in the medic's care. Angela Lansbury and William Windom star

Former jewel thief Dennis Stanton spends a romantic evening with a married woman, only to find himself the prime suspect in a puzzling murder case. Keith Michell guest stars, alongside Angela Lansbury and Dennis Cole

The historian travels to Greece to discover if there is any truth in this tale of the legendary island in the Atlantic Ocean that supposedly disappeared beneath the waves. He investigates real ancient cities that were destroyed by earthquakes, volcanoes and tsunamis - could these have inspired the story of Atlantis?

Deep in the heart of China lies one of the greatest archaeological treasures ever discovered. For over 2,000 years it was lost underground, until 1974, when a group of farmers found it by chance. We know it today as The Terracotta Army - thousands of life-sized sculpted soldiers, ready for action in the afterlife. Dan Snow travels to China to examine some of the artefacts

Since sinking on its maiden voyage in 1912, ocean liner Titanic has rested on the bed of the Atlantic Ocean below 12,000 feet of icy water. Many film-makers have visited the wreck since it was first located in 1985, but none has set out to create a full 3D record of what remains. Using the most comprehensive mapping data ever collected, this programme provides the most dynamic and comprehensive look at Titanic to date, observing the creation of a 3D map of the ship and the sea floor. Finally, the ocean is 'drained' away to give a clear view of this most famous of shipwrecks