This long white defence wall represents the remains of the city fortification and dates back to the 14th century. Wondering why Hunger Wall? Due to its shape, the wall was originally named "Toothed". After a 1361 famine, it was renamed to "Hunger" because the construction works of the wall provided the poor with jobs and thus with money for food.
Wikipedia https://en.wikipedia.org/wiki/Hunger_Wall
Address Růžový sad, 118 00 Prague 1, Czech Republic
Coordinates 50°4'58.8" N 14°23'42" E