Going back over there
One hundred years ago, the most powerful countries on Earth were in the middle of World War I. The combination of modern weapons and outdated tactics made this one of the bloodiest wars in history. About 17 million soldiers and civilians died as a result of the four-year conflict.
Though no one who fought in the Great War is still living today, you can visit many of the sites from this deadly period in history.
Since 2014, centennial events have been held at battlefields throughout Europe and at cemeteries and monuments. Tourists can visit some of these somber places, like the Tyne Cot Cemetery at Passchendaele (pictured), and see for themselves where the world's first modern war took place.
Here are the stories of seven of the most important sites from WWI that you can still visit today.