How the pyramids of Giza could be a giant map of the stars. Plus, an Indonesian volcano burning a shade of blue, the forgotten pleasures of America's recent past and how first responders brought hope to the survivors of Hurricane Katrina

Eye-witness accounts and footage, plus expert analysis and innovative special effects show what UFOs might see from their own perspective

For thousands of years, Scotland has been an epicentre of otherworldly phenomena. It is home to mysterious ancient stone circles, stories of strange beings and is a major hotspot for UFO sightings. Given these facts, it has been considered a potential magnet for extraterrestrial visitors

A Vermont woman films a Loch Ness Monster-esque creature in America's Lake Champlain. Some fear it could be Champ, a legendary plesiosaur-like creature that has been witnessed in the spot over 100 years. Deep in Russia, an enormous explosion is captured on a car's dash cam

Recollections of how a family feud escalated as the Golds revisit a past disagreement between Seth and Les over the direction of the business

Recollection of when Ashley 'quit' the business. He left Seth having to deal with the pressure of being an 'only child' at AJL

Les, Seth and Ashley recall the deal that nearly broke them and what really happened when Les allowed a $60,000 watch to walk out the door

David Dickinson and the team value antiques in Loughborough, Leicestershire. Dealers Simon Schneider and Mark Stevens are put through their paces as they help two teams examine items including a Georg Jensen bowl, a Moorcroft vase and an early fire extinguisher

David Dickinson and the team value antiques in Worksop, Nottinghamshire. Dealer Tim Hogarth demonstrates his passion for anything Scottish when a dirk - a type of dagger - is brought to his table. Meanwhile, a clockwork train makes David Ford reminisce about his youth

Two Star Wars Lego minifigures are brought in by a vendor. Rick and Chum travel to Texas, WWE Champion Booker T assists in authenticating a set of wrestling boots, while Rick looks at a Jeff Koons Balloon Dog statue

Roy uncovers a potentially lucrative item, before Bogart finds a locker that he knows a thing or two about

Competition between the auction specialists comes to a head on Rick's birthday when the buyers find several intriguing items

The buyers try their luck at locker auctions in Santa Ana, where Darrell makes a find that could mean another huge win for the Gambler

Mary makes an early start at an auction in Upland, while Dan and Laura try to make life difficult for their rivals

Brandon and Lori take one of the biggest gambles of their lives on a mystery unit

Former boxer Brandon Bernier and his wife Lori are anxious to see what is inside a locked coffin, but a rival thwarts their plans

A fire-breathing crater burns in the middle of a desert - and some suspect it is a gateway to Hell. Scientists try to work out how an eight-foot-long Bull Shark ended up in a golf course water feature. They want to know if a 'sharknado' event lifted the creature out of the sea and dumped it inland. A photographer captures an ominous ring hovering in the sky over downtown Chicago

Thousands of UFO sightings are reported every year, along with terrifying abductions and other bizarre occurrences. This series examines these accounts and explores recently declassified top secret UFO files, casting new light on historic cases

The team performs new scientific tests on the ceramic material found in the Mesa, they uncover evidence that something top secret may be buried on Skinwalker Ranch

A seller whips into the shop with an 'energy dome' hat made for the band DEVO. Corey takes a shot at a decanter set that supposedly belonged to Buffalo Bill. Meanwhile, Chum teams up with new employee Santos, to check out a vintage pinball game

Dave surprises his rivals by revealing a lighter side to his nature, and Jarrod and Brandi return to the site of a past triumph

The buyers try their luck at a new facility in La Habra, where Ivy decides to teach them a lesson. Dusty brews himself up an interesting unit, while Kenny weighs the value of childhood memories when selecting a locker

Roy arrives at an auction incognito, hoping it will improve his luck, but the other bidders are unsure about the newcomer

Ursula makes a large bid to win a fashion locker in Rick and Cindy's home town, and hopes the clothes will be worth the gamble

Along the Earth's north 37th parallel, there have been so many reports of unidentified flying objects, animal mutilations and other mysterious events that it has been dubbed the UFO Superhighway

Eye-witness accounts and footage, plus expert analysis and innovative special effects show what UFOs might see from their own perspective