Next Sunday on Remembrance Day, we will take a moment to pay tribute to the soldiers who have given their lives in the line of duty in conflicts since the First World War.
But as time moves on, the wars of the twentieth century can start to seem very distant.
We study them in history classes, but it can be easy to forget the details of what happened, and to lose sight of the fact that those battles were fought by real people.
If you're looking for a refresher on the major events of the Second World War, RememberTheWar.com is a great way to get caught up.
Click on the image below to visit the site.
On the site, you can scroll through many of the major turning points of the war, illustrated with photographs, audio and video of soldiers, leaders, and civilians.
From the speeches of Winston Churchill to the unimaginable horrors of the Holocaust, the site immerses visitors in the events of the Second World War.
The site was created by web designers Harry Ford and Phil Ricketts, with financial support from three web companies and the general public. If you like what you see, they're still seeking donations.
Another project that offers a new perspective on the Second World War is 'Ghosts of History.'
Created by historical consultant Jo Hedwig Teeuwise, these photographs remind us that soldiers and prisoners once walked on the same European streets that people use today.
To create the images, Teeuwise lays old photographs over shots of the same locations today. Here are the two pics she used to make the image above.
Teeuwise started on the project a few years ago when she came across some old negatives at a flea market in Amsterdam, where she lives.
"I was very curious about these mysterious photographs and wanted to find out who took them and where," she told The Atlantic.
Since she knows the city pretty well, she was able to find many of the places in the photographs. Then she took her own shot of the same spot, and blended them together on her computer.
But as the project grew, she started gathering pictures from cities she had never visited.
Now she uses her Facebook page to crowdsource locations, asking people if they know where a given picture was taken.
She's even started accepting pictures taken by people in other cities so she can broaden her scope.
The project is meant to get people to "stop and think about history, about the hidden and sometimes forgotten stories of where they live."
You can see the full collection on Flickr