The Human Rights Campaign (HRC), the nation's largest LGBT rights advocate, has turned its D.C. headquarters into a memorial to the 49 victims of last weekend's attack on a gay nightclub in Orlando.

The attack on the Pulse nightclub was the deadliest mass shooting on U.S. soil.

Images of the 49 victims along with the message “We Are Orlando” were installed in the group's front windows, creating an 8-story memorial.

“As we continue to mourn around the globe, our hearts, thoughts and prayers remain in Orlando,” HRC said in a blog post.

The group has also created an online vigil for the victims and the dozens wounded in the massacre where users can post messages.