Fiona Bruce is at Salisbury Cathedral, where items include a strange object linked to the Titanic, and an undiscovered letter written by Churchill.
An edition first aired to mark 80 years since the start of the Second World War.
Items include a magnifying glass linked to a 1939 Pablo Picasso exhibition.
Fiona Bruce looks back at memorable items to find out what happened next.
Items include a rare 12th-century bronze statuette brought from Calcutta in the 1920s.
Experts hear about the first British woman to win an Olympic swimming gold.
A return visit to the National Botanic Garden of Wales in Carmarthenshire.
Commemorating the 80th anniversary of the Battle of Britain and the Blitz.
Description: Bob Mortimer, Ross Noble, Carl Froch, and Kimberly Wyatt take part in a celebrity edition of the show.; Category: Factual Entertainment; 1 episode available.
Description: Two of America's most skilled 'pickers' scour for objects with collectible value.; Category: Factual Entertainment; 35 episodes available.
Description: The Top Gear presenter tries to build the longest-ever model railway track once again.; Category: Factual Entertainment; 1 episode available.
Description: James May is out to prove why traditional old-fashioned toys are still relevant today.; Category: Factual Entertainment; 6 episodes available.
Description: The presenter looks at the nation's childhood love affair with the model plane.; Category: Factual Entertainment; 1 episode available.
Description: David Jason investigates various innovations and the people behind them.; Category: Factual Entertainment; 4 episodes available.
Description: Dr Shini Somara challenges a team to reinvent designs from Practical Mechanics magazine.; Category: Engineering; 6 episodes available.
Description: Series about the dying art of repairing electronics, fronted by super-fixer Rob Howard.; Category: Engineering; 10 episodes available.
Description: Follow Brooklands volunteers and staff as they care for historic motors and airplanes.; Category: Factual Entertainment; 20 episodes available.
Description: Bob, Paul and Ted travel to Scotland to celebrate Hogmanay and ring in a new year.; Category: Factual Entertainment; 1 episode available.
Description: Comedian and mother-of-three Katherine Ryan explores out-of-the-box parenting ideas.; Category: Family Life; 9 episodes available.
Description: Guy Martin explores the past, present and future of Britain's energy sector.; Category: Engineering; 3 episodes available.