"I want to go back to Syria. There is war in my country, but we've been living for seven months in Greece like prisoners."

Adan, from Aleppo, has abandoned his dream of building a new life in Europe, like thousands of other Syrians trapped in Greece.

He's just arrived at the station in Didymoteicho, a village near the Greece-Turkey border, with his wife, three children and five other relatives, and is preparing to go through a police checkpoint before trying to get into Turkey, the start of a long journey home.

"We've been on the streets for months, with nowhere to live. When we arrived in Greece we went to the Idomeni camp where we stayed for three months," hoping to cross the Greece-Macedonia border to head for Germany, said Adan.

He describes their miserable time in the makeshift camp where over 10,000 migrants were thrown together in wretched conditions, before the Greek government eventually decided to dismantle it in May and transfer them to nearby reception centers.

Adan and his family then tried their luck in Thessaloniki, the nearest major Greece city to Idomeni, before returning to Athens.

"We realized that we are trapped by the closure of the borders and finally we've decided to go home," he said.

More than 60,000 refugees are currently trapped in Greece, many after the March 18 EU-Turkey accord aimed at sending back migrants arriving from Turkey.

Refugees and migrants find themselves with no way ahead, their hopes of traveling onward to a European country proving to be virtually impossible.

Programs for relocating or reuniting families, the only legal way of moving to live and work in Europe, have proved slow and complicated due to the reluctance of many countries who don't want to take in any more refugees.

The EU committed itself in September 2015 to relocate 66,400 refugees from Greece over two years. So far only 4,926 have left in 13 months.

A last hope for migrants is to apply for asylum in Greece - but that is also a lengthy procedure, and daunting in a country still mired in crisis, with the highest unemployment rate in the eurozone.

Dozens of refugees arrive every day at the Didymoteicho station in recent weeks. Some even have German refugee papers, and so appear to be returning from Germany, disappointed that they have not integrated there.

But apart from those who want to leave Greece, the flow of migrants in the opposite direction - from Turkey into Greece - has also increased in recent months, and police have been forced to bolster the land border between the two countries.

Since July, 70 people smugglers and over 1,000 migrants have been arrested, police say.

On Thursday an alleged Greek people smuggler was arrested near Thessaloniki transporting 40 Syrians including 15 children in a truck. They had paid 1,500 euros each to get to the Greek city, according to police.