The Miramar Hotel, located in seaside resort- Sopot, was very popular in People's Republic period (60's, 70's and 80's). Rumour has it, that the place was a scene of numerous fights and other acts of violence (among them, even an alleged murder). Due to that, it was closed in early 90's. Next to the abandoned building, there is still existing hostel, known under the Miramar name.
There is an atomic shelter beneath the building, this is what it looks like inside.