Most tourists take photos of scenic spots to remember their travels around the world, but not 77-year-old Chen Zuchang.
He has drawn over 100 pictures of the cities and countries he has visited in recent years.
The retired engineer and his wife Luo Xiansui, also 77, from Southwest China's Chongqing, love to travel.
In 2015, the couple joined an 86-day cruise around the globe, covering 18 regions and countries in the Northern Hemisphere.
It cost them each 148,000 yuan (S$30,600).
Last November, they took part in a 46-day cruise in the South Pacific, visiting 11 regions and countries.
Before the trips, Chen would do a lot of research about the destinations and draw draft sketches of the famous spots they planned to visit.
"I made preparations for a year before the global tour," he said.
He brought along a whole set of drawing pens and tools on board.
After visiting each place, while others enjoyed the facilities and activities, Chen would work in his cabin, writing a travel log, and adding colors and more details to his drafts.
"At first, my husband felt reluctant to travel and I encouraged him to see more and learn more," Zhao said.
"Now he can use his skills to make our trip more meaningful."
The retirees live a simple life and climb mountains every day to keep fit.
Unlike other Chinese seniors who usually leave the savings to their children, the couple spends all their money on travel.
They have two daughters who are very supportive of their parents' lifestyles.
"We have nothing to worry about and we prepare for everything that would happen on the road," Luo said.
This year, they plan to reach the two poles: Antarctic and the Arctic.