The Western Wall, a remnant of the ancient wall that surrounded the Temple Mount in Jerusalem. Herod the Great is believed to have started building it around 19 BC. The wall goes far below street level and many sections of the Western Wall are concealed behind structures running along the whole length of the Temple Mount. There is just a small portion that remains and is still visible.
Solomon's pool found in ruins. God gave us the measurement of Pi long before man did. ~ 1Ki 7:23 KJV - And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it round about.