The historical Grand Hotel Esplanade was once a central meeting point for the Berlin society before 90% of it was destroyed during the Second World War.
The entire facade and and remaining rooms of the Esplanade were restored to their original grandeur to serve as an architectural museum. Construction works at the Potzdammer Platz because of zoning plans, the whole project had to be moved and the facade is now displayed behind a protective glass wall.
You can read more about the history here
Linking to Weekend Reflections