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

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

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

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

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.

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+.

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

After Hurricane Katrina passed, citizens soon discovered the levees breached, quickly flooding New Orleans like a bathtub. (2 of.

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

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

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.

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+.

After the Twin Towers fell, doubts grew - but bold new safety breakthroughs sparked a surge, as taller, stronger skyscrapers rose worldwide.

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.

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