Like 遮住, the 住 here is a result complement showing the fascination 'holds' - you're completely caught. Often used in passive 被...迷住 (bèi...mízhù) or 把 constructions.
usage
迷住 is stronger than 吸引 (xīyǐn, to attract). It implies being unable to look away or think about anything else - truly spellbound.
