A message from the West to the East "Unsere Freiheit ist Eure Staerke" "Our Freedom is your Strength".

A visit to East Berlin was permitted for one day on a tourist visa as long as you were back by midnight.
Although there were several crossing points for cars, bureaucratic regulations made it difficult to get permission to enter by car.
Therefore, most Westerners took the train to Friedrichstraße station where papers were checked in a building called the “Tear Palace” (Tränenpalast),
because so many heart-breaking goodbyes took place there. Once inside the checkpoint, visitors had to pay a transit fee and exchange a set amount of money before they were ready to go.