Built in 1889, this Cantonese-style mansion with southern European elements belonged to merchant Lou Wa Sio (aka Lou Kau), who also commissioned the Lou Lim Ioc Garden. Behind the grey facade, an intriguing maze of open and semi-enclosed spaces blurs the line between inside and outside. The flower and bird motif on the roof can also be found in the Mandarin House and A-ma Temple. Free guided tours on weekends (from 10am to 7pm).