The Kotel, or Western Wall in Jerusalem, is the last standing remnant of the Second Temple, dating back to the year 515 BCE.
When I was at the Kotel, I actually did witness a pigeon crapping on a Hasidic fellow davening up close to the wall, leaving a long white streak down his kippah and black coat. The man simply looked up and went back to his prayers.
Some people say you'll have good luck when a bird craps on you. Others believe this is just something one says to feel better about being defecated on by an animal.
Allahu Akbar is an Arabic term meaning "God is Great".