Østre Gasværk Teater

Østre Gasværk Teater is a theatre in the Østerbro district of Copenhagen, Denmark, located in an abandoned gasholder house of the former Østre Gasværk. The theatre is constructed within the masonry shell that used to house the gas holder, also known as a gasometer, proper. Built in 1883, it was one of the first independent works of Martin Nyrop, who would later become known for his design of the Copenhagen City Hall.

Source: Wikipedia