When most people think about traveling around the world, they may go by plane but may never think of going on foot.

Alexander Campbell, a 27-year-old man, plans to spend four years walking 40,000 km, across 30 countries and four continents (洲), just because he really likes walking. Mr Campbell started his trip from the Sydney Opera House in February. He made his way through western Sydney to Penrith and onto the Blue Mountains.

Campbell makes the trip to raise (筹集) money for the Fred Hollows Foundation. The foundation helps people with eye problems across the world. Now Mr Campbell has raised over $5,500 for it.

There are 43, 000, 000 people having eye problems in the world, and most of them are in Asia (a continent). Mr Campbell’s trip crosses many places of the area. He hopes he can help those people.

A great wonder of the natural world

When I arrived, it was early morning and it was raining. I looked to the east — the sky was becoming gray. I got out of the car, went through a gate and walked along a dark path. There was nothing to see, but I knew it was there.

After about a mile, a stranger appeared in front of me. “Am I going the right way?” I asked. He knew where I was going. “Yes,” he replied, “you’ll get there in five minutes.” Finally, I came to some rocks, and stopped. I looked carefully over them, but it was still too dark to see anything.

Suddenly, the clouds cleared and the rain stopped. The sun rose behind me and shone on the rocks, I saw that ground fell away and down to a river, far below me. I was looking across one of the wonders of the natural world — the Grand Canyon（大峡谷）.

I looked down to the Colorado River about 1 mile below me. If you put the two tallest buildings in the world at the bottom of the canyon, they still won't reach the top. Then I looked across to the other side of the canyon. How far is it? It's 15 miles, maybe more. Finally, I looked to my left and to my right, and on both sides the canyon went far away for more than 200 miles. The Grand Canyon is not just big. It's huge！

I stayed by the canyon for about half an hour, and I asked myself, “Is the Grand Canyon the greatest wonder in the natural world?” I certainly know the answer. What do you think?

Many people like traveling during their vacation. They go to mountains, seaside, or forests. Some people like history so they like to visit old castles (城堡), museums and monuments (纪念碑). In many foreign countries, the travel agent (旅行社) can help you plan your holiday. You can tell the travel agent what kind of holiday you like, how much money you want to spend, and the travel agent will give you a lot of information about where to go, how to get there, where to stay, and what kind of activities you can do there. One of the holidays is called “package holiday”. That is, you just pay the money, and the travel agent will plan everything for you, the ticket for the train or plane, the hotel, the activities, etc.