After making their fortune in arms-dealing, the Trip brothers commissioned a young Dutch architect, Justus Vingboons, to build the Trippenhuis in 1660. It's a greystone mansion with eight Corinthian columns across two houses, one for each brother. In a nod to their ignoble profession, the chimneys are shaped like mortars. It's closed to the public, but worth checking out from the street.
