London is Full of Fake Houses… Why?

The buildings at 23-24 Leinster Gardens are hollow facades built in 1868 to conceal an open-air ventilation gap for the world’s first underground steam train line, allowing wealthy residents to avoid seeing industrial infrastructure.

• Empty shells — These structures are essentially five-foot-thick walls with no rooms, floors, or inhabitants behind the exterior [01:07].

• Hidden infrastructure — Developers built the facades to cover a hole in the Metropolitan Railway, which was necessary to vent steam, heat, and exhaust fumes from the underground trains [01:27].

• Social aesthetics — Wealthy Victorian residents refused to have an exposed railway disrupting their street's elegance, so the developers created a visual barrier to maintain appearances [01:43].

• Heritage status — Transport for London maintains the structures, which are legally protected as Grade II listed buildings, placing them in the same category as notable historic homes and public sites [02:29].

• What was the sale price of a neighboring property in 2022?

• What other types of buildings share the same heritage status as these facades?