Bloody love a good sign...
70s/80s Soviet sign at Duga-1 OTH radar transmitter, Chernobyl - "PASS PROHIBITED. TERRITORY (OBJECT) GUARDED".
Midland Hotel laundry chute sign c.1925, Manchester - a polite warning from the aptly named 'A. Towle' (Arthur Towle, Controller of hotel chain).
A plethora of signs on and around a Guardian Underground Telephone Exchange door in Manchester, taken in 2017.
Big Brother House, Borehamwood - 2017; various:
Sign on transmitter building to warn of falling ice from 1000-foot mast at Winter Hill Transmitting Station, nr. Horwich. Taken 2017.
Old Granada Studios, Manchester - 2015-2017; various: