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Beneath the Surface: At Amsterdam Central around 100 homeless people gather daily. Workers Marieke and Fikret offer help while staff tackle disruptions and bike clear-outs. (S2, ep 3) 7+

Battle For Norway: In April 1940, German battleships infiltrate Norwegian fjords in a bid to seize key ports and secure Hitler's supply of iron ore. (S3, 1 of 6) 7+

Hunt for Hitler's Bismarck: A fearsome new Nazi battleship, sets sail for the Atlantic with a mission to destroy Allied supply ships. (S3, 2 of 6) 7+

Battle of El Alamein: German and Italian tanks roll into British-controlled Egypt in a bid to capture the vital Allied supply route through the Suez Canal. (S3, ep 3 of 6) 7+

Free Fall: Experts investigate the mysterious malfunction that caused Qantas Airways Flight 72 to take a sudden nosedive over the Indian Ocean. (S17, ep 7) 7+

Teleshopping.

Teleshopping.

Teleshopping.

Teleshopping.

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The Experiencers: For years, people have reported strange sky-sightings and encounters with entities despite the stigma of sharing such experiences. Part 1.

Mystery of Alien Abduction: Reports from people who say they've been abducted are explored. A Harvard psychiatrist who takes them seriously comes under attack. Part 2.

Pilots Speak Out: The stigma surrounding UFOs extends beyond the US government. Pilots fear for their jobs after encountering mysterious phenomena in flight. 7+

Cosmic Alignment: From Angkor Wat to Ireland's Newgrange, ancient sites align with the cosmos, revealing sacred design and celestial wonder. (S1, ep 2) 7+

Glass - one of the most versatile materials in the construction world. It's both practical and beautiful, but when it fails, it's not all it's cracked up to be. (S1, ep 3)

Urban construction relies on two types of cranes to hoist the next high-rise - but when they fail, they make one big mess. Plus, discover the bad side of escalators. (S1, ep 4) 7+

The Coming Storm: It's a vibrant New Orleans summer when Hurricane Katrina looms. Residents recall how they navigated the impending disaster. (1 of 5) 7+

Worst Case Scenario: After Hurricane Katrina passed, citizens soon discovered the levees breached, quickly flooding New Orleans like a bathtub. (2 of 5)

A Desperate Place: Rescues continue as thousands remain trapped. In the Superdome, survival stories emerge while media shifts focus to looting over aid efforts. (3 of 5)

Shoot to Kill: Post-Katrina, Gen. Honoré leads rescues as evacuations fail. Violence grows, militias emerge and thousands remain stranded across the city. (4 of 5)

Wake Up Call: Residents navigate the uncertainty of how and when they might restore their lives. In the wake of the chaos, a plan for the city unfolds. (5 of 5)

Crystal Cathedrals and Buried Bunkers: Marvel at Poland's salt mine, explore a Cold War bunker, uncover an ancient Egyptian site and probe China's mysterious Longyou Caves. (S1, ep 2) 7+

Rise of the Supertalls: After the Twin Towers fell, doubts grew - but bold new safety breakthroughs sparked a surge, as taller, stronger skyscrapers rose worldwide. (S1, ep 5)

Gary Harrington: A former Special Forces soldier turned CIA officer faces a brutal call when an ally vanishes - launch a rescue or risk walking into a deadly ambush... (8 of 8)

Free Fall: Experts investigate the mysterious malfunction that caused Qantas Airways Flight 72 to take a sudden nosedive over the Indian Ocean. (S17, ep 7) 7+

Miracle Escape: On 2 August 2005, Air France Flight 358 skidded off the runway in Toronto. An engine caught fire, trapping 300 passengers on the plane. How did they escape? 7+