what can you tell me about its architecture?
Solomon's Temple was built atop what is known as the Temple Mount in the 10th century BCE and destroyed by the Babylonians in 586 BCE, and the Second Temple completed and dedicated in 516 BCE. Around 19 BCE Herod the Great began a massive expansion project on the Temple Mount. In addition to fully rebuilding and enlarging the Temple, he artificially expanded the platform on which it stood, doubling it in size.
Western Wall
 Solomon's Temple was built atop what is known as the Temple Mount in the 10th century BCE and destroyed by the Babylonians in 586 BCE, and the Second Temple completed and dedicated in 516 BCE. Around 19 BCE Herod the Great began a massive expansion project on the Temple Mount. In addition to fully rebuilding and enlarging the Temple, he artificially expanded the platform on which it stood, doubling it in size. 
where is the wailing wall and why is it a holy spot The Western Wall's holiness in Judaism is a result of its proximity to the Temple Mount. Because of the Temple Mount entry restrictions, the Wall is the holiest place where Jews are permitted to pray, though the Foundation Stone, the most sacred site in the Jewish faith, lies behind it. is the wall sectionized? Yes,  the southern part of the Wall and  the Little Western Wall which part is used as the prayer section? Western Wall where is it situated? Old City of Jerusalem
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Western Wall [SEP] Construction and destruction (19 BCE–70 CE)
According to the Hebrew Bible, Solomon's Temple was built atop what is known as the Temple Mount in the 10th century BCE and destroyed by the Babylonians in 586 BCE, and the Second Temple completed and dedicated in 516 BCE. Around 19 BCE Herod the Great began a massive expansion project on the Temple Mount. In addition to fully rebuilding and enlarging the Temple, he artificially expanded the platform on which it stood, doubling it in size. Today's Western Wall formed part of the retaining perimeter wall of this platform. In 2011, Israeli archaeologists announced the surprising discovery of Roman coins minted well after Herod's death, found under the foundation stones of the wall.