A long stream of migrants remains stranded in Serbia, waiting to sneak across Hungary's fortified border and past its fearsome police patrols.
It is the northern winter, and it is bitterly cold.
An aid volunteer in Belgrade, Nuno Miguel, says it is beginning to take its toll on the people's morale and psyche.
"One month ago, two months ago, too much cold, toxic smoke inside, a lot of people, then people start to decrease. Now the population is increasing again, and there's another kind of problem. There are lots of volunteers helping them with good food, helping with the food, but now the problem is their minds. They're getting very (depressed). The waiting is … I think they see that they can't manage to pass the borders."
It has been a year since the European Union and Turkey signed the controversial deal to keep further migrants and refugees out of Europe after they reached Turkey.
Balkan countries sealed their borders to the flow of people before the agreement, with Hungary reputedly applying the harshest measures to keep people out.
A migrant from Pakistan named Shadeed says he survived abuse at the hands of the police.
"Sometimes they capture us, sometimes some people run from them, then they put dogs on it. Then they capture (people), and, even after that, first of all, they take their phones and break their phones, because peoples use a map or something, okay? And after that, they ask us, 'Lay down,' and then they start. Sometimes three hours they beat, sometimes four hours. Women ... men."
The outlook seems to get bleaker for nearly 8,000 people stuck in Serbia, with around a quarter of those being counted outside official camps.
Turkish president Recep Tayyip Erdogan has threatened to drop the deal with the European Union to readmit people who crossed into Europe via Turkey.
Under the EU-Turkey Readmission Agreement, Turkey has agreed to also work to keep migrants from crossing into Europe, in return for funds to help it deal with about 3 million migrants and refugees.
But Mr Erdogan's latest comments follow a stand-off with some European nations over their reluctance to let Turkish ministers hold campaign rallies in their countries ahead of a referendum.
And in a televised speech, he said the European Union could "forget about" the migrant-and-refugee deal.
He accuses the European Union of failing to keep a promise to grant Turkish nationals the right to travel visa-free in Europe.
"My dear friends, the European Union had promised on the visa-liberalisation issue, but they don't keep their promises. Now they're talking about the readmission agreement. What readmission? Forget about it. You are not letting my minister into the Netherlands. You're not giving landing permission to my foreign minister. You're not giving access to the consulate building -- which is my territory. You won't let (Turkey's family minister) have a meeting there. And you expect us to give you access to Turkey? There's no such thing."
Amid all that, in the Czech Republic, Chinese artist and political activist Ai Weiwei has put Europe's migrant-and-refugee crisis at the centre of his latest work.
Entitled 'The Law of the Journey', it is a 70 metre-long, black rubber boat with 258 figures inside, suspended from the ceiling at the National Gallery's Fair Palace in Prague.
He says it reflects his concern with the plight of people who embark on their dangerous and often tragic journeys to Europe by sea.
"As a world, we are so much smaller. You know, what happens in China, India and the United States is becoming more and more connected. It has so much to do with the people who are unfortunate. And the people who prosper to a huge, huge profit after globalisation are deeply responsible."
