S1 E9 What Lies Beneath A look at tales of strange things below Earth's surface, including sea beasts, hidden cities, and tunnels carved by giant sloths.

S5 E9 Extraordinary Structures Throughout the world, there are ancient structures that defy explanation because even with today's technology they would be nearly impossible to duplicate.

S17 E19 I Don't Give a Dime A seller brings in a diamond made from the DNA of a musical genius and a vintage collection of paperbacks books. Meanwhile, Floyd Norman draws Rick's attention to his collection of prints. Plus, Chum has a surprise in store for Rick's birthday.

S12 E27 No Pawn for You! A chair belonging to Abraham Lincoln comes into the shop, and Corey and Chum check out a vintage Nintendo Donkey Kong arcade game.

S12 E28 First Lady of Pawn A WWE Hall of Fame ring is brought into the shop; Corey checks out a 1927 Essex Sedan rat rod; an 1891 $1 silver certificate.

S2 E2 Mary I: Bloody Mary Professor Alice Roberts explores the death of the infamous Bloody Mary, who experienced phantom pregnancies in her desperation for a child and heir.

S24 E11 Little Shop of Wonders Mike and Jersey pick a little shop of wonder in the heart of Manhattan. And Robbie chases down the holy grail of brass-era signs.

S6 E10 Army In a special five-part competition, top bladesmiths from each branch of the US military compete to earn a spot representing their branch in a battle. Round one belongs to the Army, as four soldiers must forge a special forces V-42 stiletto.

S14 E3 In Pain in the Membrane In Victorville, a friendly duel runs Dusty up, but his vinyl might save him; Ivy's locker shines some light on the business; Lisa learns that she needs her locker about as much as she needs a hole in her head.

S14 E4 How the West Covina Was Won In West Covina, Lisa is so busy looking back that she makes the worst auction mistake; Rene finds a bargain and really makes the most of it; Ivy unfolds his way to a profit and unloads some stuff onto Lisa.

S7 E9 Les Sells Out Les has finally heard enough from Seth and Ashley about his bum watchband deal and bets that he can sell them off just to get the kids off his back and Ashley turns barber for a day.

S7 E10 You Bet Your Butt Following the quirky day-to-day operations of American Jewelry and Loan, a family-owned and operated pawn shop in Detroit, Michigan. This time, Seth and Ashley start the day with a wager that leaves one of them dressed to the nines.

S17 E19 I Don't Give a Dime A seller brings in a diamond made from the DNA of a musical genius and a vintage collection of paperbacks books. Meanwhile, Floyd Norman draws Rick's attention to his collection of prints. Plus, Chum has a surprise in store for Rick's birthday.

S12 E27 No Pawn for You! A chair belonging to Abraham Lincoln comes into the shop, and Corey and Chum check out a vintage Nintendo Donkey Kong arcade game.

S12 E28 First Lady of Pawn A WWE Hall of Fame ring is brought into the shop; Corey checks out a 1927 Essex Sedan rat rod; an 1891 $1 silver certificate.

S24 E11 Little Shop of Wonders Mike and Jersey pick a little shop of wonder in the heart of Manhattan. And Robbie chases down the holy grail of brass-era signs.

S1 Chinese Revolution (Part 3) The history of modern China is told from the birth of the republic in 1911, through the civil war, the bloody Japanese occupation, the rise to power of Mao and the Communist Party, the Cultural Revolution, to the present day.

S7 E11 Homefront Heat Ashley is livid when she gets cut out of a deal by Les and Seth. Trying to keep the peace and the business running smoothly, Les separates the siblings, but the battle spills onto the sales floor in a huge way.

S7 E12 Strike Out The sibling rivalry between Seth and Ashley is at an all-time high and when Ashley faces down not one, but two baseball deals that are clearly outside her comfort zone, Seth cries foul.

S3 E7 Witch's Broomstick, UFOs vs. Volcanoes, and Oakville Blobs Is a witch's broomstick floating in midair the real deal or just an elaborate Halloween hoax? Are UFOs using volcanoes as hidden bases of operations? Do fossilized footprints found in Texas prove that dinosaurs and humans walked the earth together?

S17 E20 Saints and Winners A customer offers up wardrobe made for the character Tony Soprano; Rick and Chum take a trip to Italy for some papal artifacts; a rare toy intrigues Cory; Rick seeks out a rare book; the guys test-ride two Vespas.

S14 E5 King of Orange Chicken Rene shows up in Orange, declaring himself the King, while Dusty isn't quite ready to concede the title; Kenny accidentally re-invents the wheel; Lisa sees things from a slightly different perspective.

S14 E6 Lego My Locker The units are packed full in Stanton, as Darrell has to deal with Kimber's eyes on a competitor. Ivy brings a full truck, hoping for a second haul. Dusty unpacks what could be the ultimate assistant, while Rene's hunch serves him well.

S1 E1 The Gladiators In 80 AD Emperor Titus opens the Colosseum with 100 days of spectacular games, including one of the most famous gladiatorial matches in Rome's history. After forming a close bond in their training school, two gladiators must now fight to the death.

S1 E2 The Builder When master builder Haterius constructs the Colosseum from the ashes of Nero's Golden House, his work is far from over. New Emperor Domitian tasks him with adding in a complex network of underground tunnels: the hypogeum.

S13 E2 Pawn No Evil Chum checks out a Japanese animatronic monkey and a painting that reveals Glenn Ford's love affair with Marilyn Monroe.

S12 E21 Titanic Pawn A 1906 silver half dollar that belonged to a passenger on the Titanic comes into the shop. There is also a first edition of `The Strange Case of Dr Jekyll and Mr Hyde'.

S23 E20 Naughty and Nice Mike and Danielle scour a sensory-overload attic in Detroit while Jersey and Robbie follow a random lead to a late collector's mighty stockpile.

S6 E11 Branch Battle: Air Force In Round 2, four airmen from the US Air Force must forge a bolo knife using the san mai technique to combine high carbon steel with helicopter parts. Later, two smiths return home to forge an Air Force NCO sword.

S20 Secrets of the Sumerians More than 7,000 years ago, the ancient Sumerians established what is considered the world's first civilisation, and they credited their extraordinary achievements to their gods, the Anunnaki.

S2 E3 Henry IV: The Usurper Best known for usurping and murdering his cousin, Henry IV suffered from a mysterious debilitating skin condition during the later years of his reign.