millenniums
despite the title of the gallery, nothing ephemeral here
1. Aurelianus Walls currently inhabited (2000 years)
2. Medieval civil houses (1000 years)
3. Renaissance garden (500 years)
4. Modern buildings around (150 years)
Enough bizarre spot, for me to be intrigued!
(oh wait, there are 2 transient things: the photographer and the clouds)