The Tower of Ramla, also known as the White Tower, was built in the 13th century. It served as the minaret of the White Mosque al-Masjid al-Abyad erected by Caliph Suleiman in the 8th century CE, of which only remnants remain today. The tower is six-stories high, with a spiral staircase of 119 steps. You may be able to walk up to the top, where there are great views of the Tel Aviv area.
The Arches Pool is a large underground cistern with an arched roof, built in the 8th century. You used to be able to take a boat tour inside, unfortunately since 2007 it is closed due to structural weakness.