Alan Ying

Alan and Sydney Ying, who won the 2017 World's Greatest Travelers title in the Global Scavenger Hunt. Sydney was 14. This year her younger sister Emory turns 14, and Dad and daughter are gearing up for Emory's turn. This 2017 photo of Alan and Sydney's epic journey is taken in Sigiriya, an ancient city in Sri Lanka built atop a massive, flat-topped column of stone.

THE PYRAMID CHALLENGE  Traverse and enter all the major pyramids by hoofed animal. Options were camel, donkey, horse or goat-drawn carriage. The Yings found camels.

THE SPA CHALLENGE Partake in all the healing properties of Iceland's Blue Lagoon geothermal spa. The spa is located in a lava field in Grindavík on the Reykjanes Peninsula, southwestern Iceland. It's several square kilometers in size, is always at 100 degrees Fahrenheit, and is of uniform depth throughout.  "It was definitely a highlight," Alan Ying reported.