More than 4 million people a year visit the hallowed Arlington National Cemetery in Virginia. This Memorial Day weekend, visitors from around the world will pay tribute there to the fallen. They’ve been tweeting photos, Vines, and YouTube remembrances.

If you have a chance to visit, take it. Nowhere does the message “Freedom isn’t free” hit home more powerfully than here.

President Obama is scheduled to pay his respects at Arlington National Cemetery later today.

President Reagan said it best: