Machu Picchu is a spectacular sight, but its location meant considerable hardship for builders. Heavy rainfall and earthquake t...
(02:59)The theological implications of this important biblical document are explored by scholars and scientists.
(01:04)Yves Rossy wheels his jet-powered wing to the ‘launch’ plane at Calais in readiness for his historic flight.
(01:44)Go behind the scenes with Chris Barrie during the making of Britain's Greatest Machines.
(03:29)Series Producer, Hugh Whitworth, talks about making Britain's Greatest Machines.
(03:11)In New York City, thousands of animals wait to be saved. From the lost to the abandoned and abused. One group of former street ...
(01:08)Meteorologist Fritz Coleman discusses global warming.
(01:45)Bryan Penprase discusses the uses of the ancient kivas and what was used for ancient mortar at Casa Rinconada.
(03:13)Did aliens really crash in the Brazilian jungle?
(01:13)Could a sighting in the Rockies have something to do with gruesome animal mutilations?
(01:04)Is a secret military base in California covering up evidence of UFOs?
(00:49)A young Fresno couple has a close encounter after a trip to the grocery store.
(02:04)Could a major mass sighting in Texas be proof of life on other planets?
(01:15)Ryder, Ben, and James have a little too much fun in alien-inundated Roswell, New Mexico.
(02:49)LIGO's (Laser Interferometer Gravitational Wave Observatory) Gabiela Gonzalez discusses gravitational wave astronomy.
(01:07)Investigators recreate the Dayton car crash.
(02:41)Investigators examine how Andrew survived this crash.
(02:28)The team heads to Arizona to investigate one of the most famous sightings in history.
(01:01)Ryder sees a mysterious flash in the night sky and attempts to chase it down over dangerous terrain.
(02:47)Richard Hammond gets the ride of his life hundreds of metres below the waves to reveal the ingenious inventions that built a sk...
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