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At Mexico City's Templo Mayor, archaeologists uncover a 15th-century tower of 600 skulls, revealing new insights into Aztec sacrifice and ritual.

The hunters must adapt their strategies to not only bag their quarry but also prevent their hard-earned catch from spoiling under the unrelenting sun.

Under moonlit waters, Daniel and Zak race to catch gators, seizing the chance of a feeding frenzy in the open.

One of Ian's most infamous show cars, Space Junkie, returns to the shop. The gem is in desperate need of rehab and Ian brings it back to life.

Season 3-5: Inspired by monster trucks of the past, Ian builds a custom dirt machine using a 4x4 truck and a vintage Pinto body and turns it loose in the desert.

New discoveries in the Swamp and Money Pit area lead to a potentially history-changing revelation for the team.

The Gambler returns to form in Huntington Beach. Rene gets on everyone's bad side, while Ivy's prospects are cloudy at best.

Rene is shocked by what he finds. Darrell's locker multiplies his investment, and Ivy tests his radar on the best.

Brandi and Jarrod uncover an Illuminating stash, Dave does what he does best while Mary finally gets the help she needs.

Two Bids: Mary tries to impress a client, Rene finds protection from predators and Ivy heads to the barbershop.

Rene laughs all the way to the bank, while Darrell reels in a hoard of goodies.

Brandi saves a loose pooch from oncoming traffic, Darrell's locker confirms his Magic Bullet Theory, while Kenny's unit serves up a shiny score.

Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich. (4 of.

Dan Jones visits Lancaster Castle to explore its grisly history of crime and punishment, including the infamous Lancashire Witches trials. (5 of.

Dan explores the history of the Earls of Arundel, how knights fought in the Hundred Years' War and how the Castle would have prepared for Queen Victoria's 1846 visit. (6 of.

Boudicca's Rebellion AKA the Battle of Watling Street: Rob investigates the events leading up to the Iceni queen Boudicca's uprising against the Roman invaders during 60-61 AD.

The owners of 1870, Richie and Kimberley, are learning the hard way that all that glitters is not gold.

Passengers are searched for illegal objects when entering and leaving the United States by the Department of Homeland Security's Customs and Border Protection officers.

Passengers are searched for illegal objects when entering and leaving the United States by the Department of Homeland Security's Customs and Border Protection officers.

Officers race to Port Newark, where a West African car gang is trying to ship a stolen luxury vehicle out of the country.

Agents investigate a small boat crewed by three men on a well-known smuggling route, only to confirm the men have a shady past.

The Hells Angels' thirst for expansion turns to blood sport when a new territory becomes a battleground.