A mysterious disc found in the Sulphur Fork River brings a surprising outcome. Plus, other finds include weapons buried in a family’s backyard, a cryptic coin found on the Lewis and Clark Trail, and two objects that would be of great historical significance if authentic – General Custer’s rifle, and a carved clue in the disappearance of a Revolutionary War soldier.

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The guys meet a man who says he can prove he has a bloodstained pistol that was owned by outlaw Jesse James. Dale visits a farmer who thinks he found proof of aliens in his own backyard. Plus, the guys try to figure out how two men discovered similar valuable objects about a hundred miles apart in the Midwest.

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While Blue and Mike examine what looks like an ancient axe, Dale inspects an artifact found in a storage locker which may be tied to a brutal practice used on slaves. Plus, a wooden alligator surfaces that could link the Aborigines to America, and a man’s hand-carved pipe causes speculation on whether the U.S. was once the mythical homeland of the Aztecs.

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Dale meets a man who wants to prove he found the original knife of folk hero Jim Bowie, but they get an even bigger surprise. Plus, an alleged Viking artifact found in Maine, a possible Mayan idol, and what looks like a weaponized bracelet found on a man’s land in Texas.

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Dale and Blue examine whether a woman who found a letter hidden behind a picture frame stumbled on a lost piece of Abraham Lincoln correspondence that could be worth up to $1 million dollars. Mike is on a mission to connect a pair of 2,000-year-old pots found in Arkansas to conquistador Hernando de Soto. The guys also look into the value of a jade disc found in a man’s backyard, a face carving discovered on the shores of the Chesapeake Bay, and a piece of carved coral that’s a perfect match for a prized object in the British Museum.

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The guys try to uncover why and how medieval scale armor was abandoned in the Arizona desert. Plus, they investigate an artifact that could connect to early Christianity, a sword found in a well, a curious clasp, and a ring found in a Los Angeles tree root whose owner thinks it could be Aztec.

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Blue meets a family who found a death mask that could be evidence of a murder in the mines. Dale meets a man who thinks he has an ancient Egyptian scarab stone inscribed with a secret message, while Lily and Leonard crack the case of a mysterious object found near the Oregon Trail. Plus, the guys take to the water to figure out if corks found in the Merrimac River are tied to a valuable shipwreck.

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A strange brass ball has Leonard and Blue intrigued, while Dale tries to figure out whether a man has a rare microscope owned by Thomas Jefferson. Later, Mike and Blue launch a full-scale archaeological dig at what could be the site of a lost battlefield tied to Andrew Jackson. Other finds include a strange carving pulled from a Connecticut river and a broken statue treasured by one man's father.

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The guys look at two objects that may be worth big money...if they're not cursed - a bird whistle and a strange pendant with a history of preceding bad luck. Plus, the guys examine a mysterious object saved from the destruction of Hurricane Katrina, and an alleged Viking drinking horn found by a man whose wife wants to throw it out.

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Lily and Dale perform tests on a gold-colored urn and soon find themselves investigating its ties to an ancient blood ritual. Meanwhile, the guys try to figure out whether a spyglass found on a mountaintop belonged to a famous explorer. Other finds include a mysterious statue, a carving found deep beneath a Dallas skyscraper, and a coin that turns out not to be a coin at all.

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