Riddle of Sardinia Tower

Satellite images capture a triangular castle-like tower located on the Mediterranean island of Sardinia; experts investigate the relics of a declining ancient civilization that may have suffered a celestial catastrophe.

Freiwillige Selbstkontrolle der Filmwirtschaft

The relics of a declining ancient civilization that may have suffered a celestial catastrophe.

What on Earth?

Circles of the High Kings

Satellite images capture two conjoined circular structures embedded in the landscape of Ireland; experts investigate an ancient site linked to legendary figures and the elusive hunt for the Ark of the Covenant.

Experts investigate an ancient site linked to the elusive hunt for the Ark of the Covenant.

Doomsday Lair of Greece

Satellite images capture bizarre structures fenced within a remote mountaintop complex on the Greek island of Kefalonia; experts investigate and discover a network of massive satellites linked to a hidden NATO doomsday communications bunker.

A network of massive satellites linked to a hidden NATO doomsday communications bunker.

Mystery of the Welsh Mine

Satellite images capture monumental ruins surrounded by bizarre feather-shaped structures on a Welsh mountaintop; experts investigate a hidden tunnel containing the remains of an abandoned slate mine with an exploitative and deadly past.

Experts investigate a hidden tunnel containing the remains of an abandoned slate mine.

Nuclear Ghost Towns

Satellite images capture a mysterious collection of sprawling towns that appear to be completely unoccupied in Belarus; experts investigate and uncover a horrendous state-sanctioned cover-up responsible for claiming thousands of innocent lives.

A collection of sprawling towns that appear to be completely unoccupied in Belarus.

Lair of the Living God

Satellite images capture a bizarre, cone-like structure perched on the summit of a mountain range in Turkey; experts uncover one of the most extraordinary engineering projects of the ancient world linked to the legacy of a living deity.

Satellite images capture a cone-like structure perched on the summit of a mountain range in Turkey.

Curse of the Full Moon

Cosmonauts are trapped in a capsule in a frozen lake; a NASA scientist investigates the Hindenburg; the full moon affects experiments.

Departamento de Justiça, Classificação, Títulos e Qualificação

Cosmonauts are trapped in a capsule in a frozen lake; a NASA scientist investigates the Hindenburg.

NASA's Unexplained Files

Did Earth Have Two Moons?

A theory of Earth's abiogenesis may have started in the clouds of Venus; a look into the claim of Earth having two moons; a NASA scientist helps the FBI solve the 1996 Olympic bombing.

A theory of Earth's abiogenesis may have started in the clouds of Venus.

Mystery of the Invisible Planet

A probe malfunctions without cause as it enters deep space; a mission goes astray when an imposter breaches Mission Control; evidence of an invisible planet within the Solar System.

A probe carrying a message for aliens malfunctions without cause as it enters deep space.

Mars's Deepest Secret

Soviet photos of the moon are intercepted by the CIA; a malfunction aboard the ISS, which imperils the whole crew; NASA probe finds evidence of the possibility of life on Mars.

Soviet photos of the moon are intercepted by the CIA; a malfunction aboard the ISS.

Dial Thermometers; Hummus; Spent Fuel Containers

Dial thermometers; hummus; spent fuel containers; straw sombreros.

How It's Made

Filigree Glass; Fish Food; Motor Homes

Digital Dentistry; Nail Clippers; Poster Restoration

Digital dentistry; nail clippers; poster restoration; canola oil.

Composite Propane Cylinders; Salsa; Dragsters

Composite propane cylinders; salsa; water-pumping windmills; dragsters.

Kitchen Accessories; Central Vacuums; Hydraulic Cylinders

Kitchen accessories; vacuums; paper mache; hydraulic cylinders.

Speed Skates; Synthetic Rubber; Cocoa Beans

Speed skates; synthetic rubber; cocoa beans, bulk chocolate.

Farmed Caviar; Intake Manifolds

Farmed caviar; intake manifolds, motorcycle jackets; forged spades.

Whips; Automated Pizza Makers; Incense Cones

Whips; automated pizza makers; incense cones; scale turbine engines.

Top And Bowler Hats; Solar Water Heaters

Top and bowler hats; solar water heaters; sticky buns; electrostatic speakers.

Custom Steering Wheels; Aerospace Fuel Lines

Custom steering wheels; apple pie; domestic radiators; paper towels.

Patterned Glass Panels; Road Cases

Patterned glass panels; road cases; stop-frame animation.

Cheese Graters; Hot Sauce; Silver Jewelry

Cheese graters; hot sauce; silver jewelry; traditional Mexican chairs.

Black Holes: The Secret Origin

Recent evidence could explain how supermassive black holes grow so big; neither dark matter nor cannibalism can fully explain these beasts, but the latest science may finally provide an answer.

New evidence helps science explore the origins of supermassive black holes.

How the Universe Works

Life & Death on the Red Planet

The evolution of life on Mars before a series of cataclysmic events transformed the planet from a watery world to a hostile one; scientists believe life will find a way to continue despite the setbacks.

After a series of cataclysmic events, Mars becomes a hostile environment for life.

Stars That Kill

Exploring the real-life Death Stars in the cosmos that could snuff out Earth without much effort; the science of the destructive power behind six of the deadliest stars; vampire stars; supernovas; rogue stars.

The science behind some of the deadliest phenomena in the universe.

Secret History of Pluto

The first close-up images of Pluto reveal unimaginable secrets; scientists investigate if Pluto is home to a warm ocean of liquid water beneath its surface and whether this underground ocean could harbor life.

The first close-up images of Pluto reveal unimaginable secrets.

The Dark Matter Enigma

Dark matter is the biggest mystery of the cosmos; scientists know that it has been vital to our universe since its birth, and new discoveries reveal that it could create black holes, cause mass extinctions, and might even shape life on Earth itself.

Dark matter is the biggest mystery of the cosmos; scientists know that it has been vital.

Most Violent Event in the Universe

The collision of two supermassive black holes is the most violent event that can occur in the universe; experts explore where a black hole's energy originates and what really happens when the two most powerful objects in the cosmos clash.

Experts explore what really happens when the two most powerful objects in the cosmos clash.

Asteroid: Countdown to Catastrophe

In a fictional scenario set in 2029, an asteroid hurtling towards Earth at 40,000 mph will reduce New York to ashes; examining the hypothetical, experts weigh in to determine what could happen, and how it might be stopped.

Examining a hypothetical asteroid impact, experts weigh in to determine how to avert tragedy.

Science Channel HD Schedule (Eastern Time)

Sunday, March 26