Hailing from San Diego, the brothers won a global competition, Biggest, Baddest Bucket List, run by My Destination.
Their prize: an all-expenses paid around the world blogging trip, which has seen them visit places such as Ireland, Scotland, England, Istanbul, Bali, Tanzania, Zimbabwe, British Columbia and Brazil - ending in New Zealand last week.
The trip, described as ''a tasting menu'' of travel, had been documented in their online blogs and videos as they looked at the historical, political and cultural aspects of their destinations, along with the typical tourism attractions, and had attracted 53,000 subscribers.
In Queenstown they sampled wine at Amisfield, visited the Chinese Village in Arrowtown, took a ride on the Shotover Jet, enjoyed a helicopter ride, went hang-gliding, mountain biked and completed the Nevis Bungy - no mean feat for Marko, terrified of heights.
It was the perfect ending to six months of hard work - recording and editing about 400GB of footage a week, totalling 15 terabytes by the time they arrived in New Zealand.
"It's hard for people to understand it's a very ... big amount of work.
"We'll go and see a place ... when we're finished, we go back and start editing last week's video,'' Marko said.
"We don't focus a lot on how much work it is because it's so much fun,'' Alex said.
"This ... is not about us, it's about showing people how much there is in the world.
"You can't have the coolest job in the world and expect to have your feet up.''
Following their visit to Queenstown the pair travelled to Wellington, Auckland and Rotorua, with their trip including a visit to the Weta Workshop, Zorbing, a Sky Tower jump and sailing.
The New Zealand video is likely to be uploaded on mydestination.com/bbb towards the end of January.
