[informatimago]

http://en.wikipedia.org/wiki/List_of_bridge_failures

[arethuza]

Oldest bridge still in use:

http://en.wikipedia.org/wiki/Arkadiko_Bridge

It's from Mycenaean times! i.e. Agamemnon, fall of Troy etc.

Mind you, I've been inside much, much older buildings (from 3000BC rather than 1100BC):

http://en.wikipedia.org/wiki/Maeshowe