Meanwhile, under Manhattan: As work slowly but surely but mostly slowly progresses on the Second Avenue Subway, and East Side Access, construction crews have dug some really wonderful looking caverns.

Kowloon Walled City, New Kowloon, Hong Kong

( you wake up in an empty room, must loot room, and you must find your way out of the maze) dark room

Ammonites' inspire the pattern of a man's power machine --- c. 1930, Spiral Steam Turbine. Sheet metal creativity!- https://de.wikipedia.org/wiki/Spiralturbine

1930 : Building spiral turbines Curated by Amanda Uren Source: Retronaut. ” natural forms in industry

Abfahrt, via Flickr.

Processed coal from 1851 to It became a UNESCO site in It is now a museum and cultural center. Former coal mine.