Which of these belong on the list of the Seven Wonders of the Ancient World?
The Great Barrier Reef
Great Pyramid of Giza
Which country is Machu Picchu in?
What continent is Eritrea in?
Which one of these country silhouettes suits Iceland?
Where is this place located?
What's the name of the second tallest mountain on Earth?
Can you travel from London to Shanghai entirely by train?
What state is this waterfall located in?