Sarakiniko, Milos
This lunar-like, Instagram-worthy beach lies on the north side of the beautiful island of Milos. Sarakiniko is made of polished white volcanic rocks, bordered by shallow turquoise waters, making it family-friendly. There is a little strip of sand, however, so make sure to get there early if you want your spot; otherwise, just grab your towel and lay it on the rocks for a fun sunbathing session.