Tonight and tomorrow Jews around the world remember the destruction of the First and Second Temples and many other calamities that befell our people on this day, the 9th of Av.
More about Tisha B'Av:
How I sat on the floor and read Lamentations by candlelight--here and here
Tisha B'Av at the Western Wall
Diorama of Titus breaching the city wall of Jerusalem
Remembering the destruction on the wall of one's house
That's My World today--collective remembering for thousands of years.
And for Shadow Shot Sunday too.