Kindhearted Thomas Cook customers have been leaving messages of support and thanks outside the empty branch in Manchester city centre.
An eerie photo shows the empty store on Market Street.
Letters and flowers have been left outside.
Paper and a pen have also been placed on the door for people to write messages.
One note read: "Sorry to see you closed. A lot of love, from Tunisia."
Another card read: "My heart is broken. From my first holiday, to working with you as a rep.
"Forever in my heart."
One poignant message read: "Not your fault. Sorry. Hope you find your feet."
"Brilliant service. Sorry to see you go. Love you all," someone else wrote.
Another message read: "Thank you for such wonderful service. So sorry. Another sign of the times."
Other messages said 'RIP', while some former customers wrote messages in Greek.
A bouquet of flowers was seen slotted behind the door handles of the store.
Earlier, a heart-shaped balloon was seen outside the shop.
The 178 year-old travel operator went into administration on Monday after company bosses failed to secure a last-minute rescue deal.
It is estimated 3,000 staff based in Greater Manchester are at risk, or have already lost their jobs.
Staff said they received an email at 2am on Monday morning from the CEO saying the company had ceased training.
One employee said staff stayed up all night waiting for updates on the future of their jobs.
All holidays and future bookings made with the travel giant have been cancelled.
More than 150,000 British Thomas Cook customers who have been left stranded are being brought home on replacement flights.
It will be the largest ever peacetime repatriation programme - named Operation Matterhorn - with a dozen replacement flights due to land at Manchester Airport today (Tuesday).
