Teachers slide into the world's biggest water sphere in Thailand while actors challenge one another to a race on a water slide atop the Carnival Sunshine. Then, friends get airborne thrills behind a speedboat in Greece.

A husband-and-wife team take on an 85-foot trapdoor slide in Bali, a woman celebrates her birthday swimming with larger-than-life crocodiles in Australia and four friends fly down the most extreme rapids that Jamaica has to offer.

We're at New Jersey's notorious Action Park on the world's tallest double looping slide! Piranhas await you at Brazil's infamous Natural Insano. Prepare for Argentina's twin-racing slide and Hawaii's big-air backyard slide!

Roller derby teammates go for the gold in Utah, friends test their mettle walking with sharks in the Bahamas and a couple swings like Tarzan on a 34-foot floating adult playground in Texas.

Prepare to scream your face off as we plunge 7 stories into a cave in the Bahamas. Then, brace yourself for the world’s fastest (and tallest) headfirst slide in Canada and a 260-foot, free-fall slide in Texas.

Siblings tackle a crazy twisting ride with two head-spinning vortexes in Argentina, students bounce over inflatable water obstacles in Australia and friends tube down a hidden river deep in the jungle of Bali.

Models try not to scream down dueling 75-foot waterslides in Illinois, friends hit up the world's only retractable dome water park in Germany and four moms enjoy a day off on a water ride with six 300-foot-long tubes in Indiana.

Hold tight, there's a 70-degree drop that's terrorizing the south. Wet your senses in the world's first 5D water ride experience inside a theater. And a 6-story slide blasts riders down in a heart-stopping 15 seconds.

We're going to New Zealand! Get ready to slip and slam down Mother Nature's Rere Rock. Then, plunge down the world's tallest trap-door slide in Kentucky. Next, we're off to Georgia's gravity-defying combination bowl & half-pipe.

Check out the first trap door slide in the world that tortures six at a time in New England. Brave Poland's record-breaking eight-foot wide, 610 ft long, 41-second tube slide.

Speed is the name of the game on Velocity Peak in Athol, Idaho, while Blackbeard gets his revenge aboard Carowinds newest attraction. And things get down and dirty in Cork, Ireland, at the West Cork Secret mud slide.

Expats go primal at a dinosaur-themed water park in Thailand, four friends ride the beast in Indiana and international students experience the true power of a sonic shock wave in Texas.

In Italy, people tweet, post and like every video of Aqualandia's newest attraction. Back stateside, Turbo Twisters' pitch-black tubes keep riders guessing while surfing buddies check out the world's largest surf lagoon in Wales.

Zookeepers rappel down a massive 10-story waterfall in Australia, dancers flip upside-down a drop slide in Mexico and the Tampa Bay Storm cheerleading team hits a 50-foot raft wall in Florida.

Friends embrace the rage down the West Coast's only 100-foot-high mat racer, friendly adversaries race across an inflatable obstacle course in South Carolina and brothers plummet down a six-story trapdoor slide in Ohio.

This series, which spotlights the world's best waterslides, opens with a look at the Insano in Fortaleza, Brazil, which stands at 135 feet tall. Also: an indoor, near-vertical looping slide in Vermont; an indoor bungee jump into water at the Center of Gravity in Edmonton.

Newbie rafting guides take on class-5 rapids in West Virginia, basketball teammates brace themselves for the tallest and longest waterslides in Thailand and two sisters plummet down a 245-foot slide in Missouri.

A couple hangs ten down twin drop slides in California, identical twins get swept away on a seven-story enclosed waterslide in Australia and newlyweds transform into mermaids in Florida.

At Canada’s largest waterpark, we visit a terrifying 6-story, near-vertical slide. Next, we travel to San Diego for the only wave machine in the US that lets you surf a monster curl standing up. Finally, plunge 9 stories into a shark tank in the Canary Islands.

Twins take on the planet's highest rafting challenge in New Zealand, while Ultimate Frisbee teammates in Miami reach ultimate speeds on the fastest waterslide at sea. Finally, two couples get messy on a date night in Tampa.

Take a voyage to experience a shark-infested slide in the Canary Islands, the first dueling Master Blasters in Phoenix, the world's longest thermal water slide in the Swiss Alps and the largest indoor water park in North America.

The world's tallest trap door slide at Aqualandia in Spain, a home-made slide in Minnesota that cost over $20,000, extreme water rides at Aquaventure in Dubai, and a remote slide in the jungle of Mexico.

Adrenaline junkies pull some Gs in Thailand, face the Kraken in Australia and slide out the exit door of a 747 in Oregon.

Couples raft down one of the best whitewater sections in the Rocky Mountains, childhood friends slide into the belly of the beast in Illinois and a couple of novices test out a 10-story trapdoor slide in North Carolina.

First stop, "The Beast of the Middle East," a 9-and-a-half-story water slide in Dubai. Next, it's off to Virginia Beach for 4 monster slides with more than 1,200 feet of drops and loops. Finally, we venture to homemade island slides atop mountains in Maui.

Let loose at the world's first grownups-only water park in Mallorca, Spain, then head across the pond to Waco, TX, to ride BSR Cable Park's newest addition before catching some G's spinning though Beech Bend's Cyclone Saucers.

Brothers lose their mind on the Brain Drain in Florida, three friends uncover a hidden gem in the rainforest of Puerto Rico and cruise ship cast members check out the largest water park at sea.

Surf a 180-degree wave in Brazil, check out the planet's only side-by-side dueling raft slide and ride down America's tallest twin body slide.

Friends raft down the world's largest man-made waterfall in New Zealand, young professionals take on The Challenge course in Thailand and newlyweds scream the whole way down a trapdoor slide with a 360-degree loop.

Friends hydroplane down the tallest waterslide in Tennessee, riders nervously wait to free fall down a six-story trapdoor slide in Thailand and San Diego transplants muster up the courage to say "yes" to a 75-degree drop.

Friends visit the world's tallest inflatable slide in Australia, expats explore underground caves filled with glowworms in New Zealand and couples slide down a 100-foot waterfall in Brazil.

We're trotting the globe and riding the world's most extreme water rides. From the world's tallest slide in Brazil to the world's largest indoor waterpark in Germany - we're getting wet and counting down the world's best rides.

Longtime friends climb an eight-story raft wall in Mexico, gym buddies duke it out Down Under on an inflatable obstacle course and dancers drop like it's hot down a 70-foot slide in Arizona.

Workout buddies pull themselves over the edge of one of the most terrifying freefall rides in Texas while gorgeous expats take a ride down the longest waterslide in Thailand; four friends surrender to the gods in Mexico.

Head to the world's largest indoor water park in Germany, the first near-vertical loop slide in the US, and a slide in France the locals call the "Crazy Jump".

This hour-long special details the design, testing, and construction of the 168 foot 7 inch tall Verrückt, the world's tallest water slide at Schlitterbahn water park in Kansas City, Kansas.