Wasserschloss (PiP for this year's photo)

The Sunday Challenge (TSC): something that used to be something else

So called "Wasserschloss" was built in 1905-06 (probably by Bernhard Georg Hanssen and Wilhelm Emil Meerwein) as lodging and workshop for dockworkers whose job was servicing and repairing the hydraulic winches which were needed to lift goods into the tall storehouses.
Nowadays it houses a tea shop and a restaurant.

Inset a blue hour shot taken on 30.04.2016 (30sec., f/8.0, 45mm, ISO 100, EOS 6D, EF 24-105)

Hamburg Speicherstadt and Kontorhaus district was awarded UNESCO World Heritage status in 2015: whc.unesco.org/en/list/1467