Commonly known as Notre Dame, Notre Dame de Paris Cathedral is one of the most emblematic monuments of Paris and France; its construction began in 1163 and lasted for two centuries.

It was Versailles before Versailles, a palace in the heart of Paris with a history spanning 2000 years; how has it been erased from memory and built over by successive government buildings?

December 1944: Hitler has picked the Ardennes sector for a major offensive. The surprise attack, spearheaded by elite divisions, initially sends American units reeling.

The crucifixion of Jesus changed the world; how much of our understanding of this event is true, and what answers can be found in the Holy Land to back up the Bible's story?

It was Versailles before Versailles, a palace in the heart of Paris with a history spanning 2000 years; how has it been erased from memory and built over by successive government buildings?

November 1944: as the Allies advance into Germany, they run into concrete bunkers, pillboxes, minefields and tank traps. German soldiers fight tenaciously to defend their homeland.

Begun in 1882, the Sagrada Família became Gaudí's radical engineering laboratory. In 2026, the church yet to be finished, builders use modern engineering to raise the 170-metre spires above Barcelona.

Britain and France declare war when Hitler invades Poland; in May 1940, the Germans attack Holland and Belgium as a decoy. As the Wehrmacht and Luftwaffe strike in force, the French seem trapped.

The Western and Soviet Allied forces meet at Torgau on the Elbe river; the Western troops, having landed at D-Day, descend on Germany from the West while the Soviets march from the East.

The 1969 Moon landings were regarded as man's greatest achievement; what was not well-known is that the men behind the mission were engineers of one of the darkest periods in human history.

Chambord is the largest of the Loire castles; with 220,000 tons of stone needed for its construction, it is one of the most important building sites of the Renaissance.

The Mayan city of Chichen Itza was the capital of a powerful civilisation - the 'water wizards' of the Itzas - but was mysteriously abandoned between the 11th and 13th centuries.

Commonly known as Notre Dame, Notre Dame de Paris Cathedral is one of the most emblematic monuments of Paris and France; its construction began in 1163 and lasted for two centuries.

1940: France has fallen and Hitler orders Operation Sealion - the invasion of Great Britain - to commence, but first the Luftwaffe must defeat the RAF for seaborne landings to succeed.

Hitler retreats into his bunker as the Allies advance on Nazi Germany; the Fuhrer issues frantic orders to non-existent armies as he loses his grip on reality.

Deep sea divers hunt for the wrecks of Hitler's dreaded U-Boat fleet off Ireland's Northwest coast while historians unravel the early stages of WWII's longest campaign.

Divers hunt for the wrecks of WWII's longest campaign that lie off Ireland's Northwest coast as historians explore the Allied fight back at sea and the human cost of war.

December 1944: Hitler has picked the Ardennes sector for a major offensive. The surprise attack, spearheaded by elite divisions, initially sends American units reeling.

Aachen Cathedral is a 1,200-year engineering marvel. We decode the 'smart' mortar, the hidden iron ring stabilising the cupola, and the metal reinforcements that let stained glass replace stone.

Directed by Sam Mendes, this documentary tells the story of two British soldier-cameramen - Sgt. Mike Lewis and Sgt. Bill Lawrie - who were sent to the European front during the latter part of WWII.

World War II was a battle for supremacy at sea more than any other conflict before or since; in this episode, we explore how the secret weapons of naval warfare changed the tides of history.

WWII facilitated the use of technology to wreak destruction from afar; through success and failure, the bomb was and remains a weapon that can tip the balance in favour of those who wield its power.