The one-time residence of Britain's colonial-era high commissioners, said to be the sultanate's oldest extant building, is now a museum dedicated to the longstanding 'special relationship' between Brunei and the UK. The evocative photos include views of Brunei as it looked a century ago. It's situated 1.5km southeast of the city centre, on a hilltop overlooking the river. When we stopped by in mid-2015 the museum was closed for ongoing extensive structural work (the building had been on the point of collapse).