The Walshes head to Iceland for an epic Christmas adventure, from a dramatic glacier rescue to a dip in the famous geothermal pools, they're in for a trip to remember.
The duo head back to the USA for another epic road trip, starting in sunny Florida where they visit the home of Bradley's favourite author, Key West, take to the racetrack at Palm Beach and get up close to sharks.
The final chapter in Bradley and Barney's voyage sees them visit New Orleans where they feed alligators, have a spiritual MOT and lead a street parade.
The father and son road-trip in a RV continues to Texas, where they do everything bigger - from driving tanks to experiencing space travel in a centrifuge.
Brad and Barney arrive in Ohio and head straight for Dayton - the home of aviation. After recreating history in the Wright B Flyer, the duo attend a local rodeo later that evening.
Barney and Bradley embark on the final leg of their European road trip, as they continue to explore Italy, engaging in gladiatorial combat in Rome, whizzing along a sky-high zipwire and diving off a cliff into the sea at their final stop.