A bartender on vacation is busted with heroin; a dancer is caught smuggling coke.

Desperate for cash, an American agrees to transport cocaine from Ecuador to Europe for $7,000 and gets busted, ending up in one of Ecuador's most notorious prisons.

Australian Mark O'Brien joins an ashram in India after being dissatisfied with life not realizing his actions will lead him to Yawanda Prison.

A woman's offer of work in Peru leads to incarceration, attempted murder and the ultimate betrayal.

While traveling in India, Rhys Partridge gets kidnapped by a terrorist who had been involved in the beheading of journalist Daniel Pearl.

After getting divorced and losing his job, Michael begins a new career smuggling cocaine.

Camilla and Jon set up a children's center in Chechnya before suffering through kidnapping, torture and rape.

Sarah Jackson dupes her unwitting friend Simon into being her accomplice when she decides to take a job as a drug courier.

Vietnam prisoners of war John McCain and Ernest Brace; a CIA operative rescues U.S. diplomats from Tehran, Iran, under the guise of filming a science fiction film titled "Argo."

A man, Jeremy Khinoo, regrets his decision to obtain illegal prescription drugs in Mexico using counterfeit money he made on his computer.

Scott Campbell is busted with pot in China; Duane Wollum is caught in Nicaragua with coke.

Pieter Tritton is caught with coke in Ecuador. Steve Peterson is busted with marijuana.

Ruthie Lambert is busted with coke from Peru; Susan Haglof is called a kidnapper in Egypt.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Latif Yahia is forced to serve as a body double for Saddam Hussein's son, Uday; Tom Lynch is caught escaping Iraq.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

How does the drug trade work? Can it be stopped or should it be regulated? And what are the personal costs? Those are just some of the questions asked in this series, a comprehensive look at society's most abused drugs: cocaine, methamphetamine, heroin and marijuana. First-person perspectives from traffickers, dealers, users, law enforcement and medical professionals detail how the drugs are processed and moved onto the streets, and the effects they have on the human body. It's a raw, eye-opening documentary about a billion-dollar industry.

This documentary series focuses on extreme construction projects -- be they the biggest, tallest, longest or deepest in the world -- and the machines used to create extraordinary structures. Episodes include the people responsible for the cutting-edge design and engineering of each build, talking about how concept transformed to reality. The processes that go into staffing and operating the modern marvels once they are completed are also covered.

"Lockdown" plunges viewers headfirst into life in the "big house," the gritty underworld of America's maximum-security prisons, where gangs are prevalent, predators stalk their next prey and inmates are armed with deadly weapons. But prison officials have their own weapons in the form of modern surveillance and old-time isolation -- plus steel batons and pepper spray -- to help keep the peace in these miniature war zones.

Each year the U.S. economy is flush with more than $500 billion generated in illegal transactions. From sex, weapons and drugs to gambling and counterfeit merchandise, nothing is off limits and seemingly everything is for sale. In "Underworld, Inc.," National Geographic Channel is granted unprecedented access to this "free" enterprise. Workers, suppliers, sellers, customers -- and law enforcement personnel trying to keep it in check -- share their experiences of an underground industry that is brutal, exploitive and corrupt.

Despite cameras and guards monitoring their every move, some prisoners are daring enough to test the system and execute a breakout. Told from the perspectives of both the escapees and the law enforcement teams tracking them, this series documents some of recent history's high-profile jailbreaks and the various methods officials use to outsmart the criminals, leading to their eventual recapture.

Each year adventurers make Alaska's mighty Yukon River their home for five weeks. They float downstream on homemade log rafts to sell firewood and other supplies to remote villages. The reality-documentary "Yukon River Run" presents hourlong episodes tracking the progress of various crews. As harsh winter months approach and threaten both safety and success, stakes are heightened as rafters endeavor to cash out and escape from the cold.