The yellow diamond-shaped "T-intersection" warning sign is characteristic of Australian road signage. The presence of eucalyptus trees and palm trees in a park-like setting strongly suggests a temperate Australian climate. The road markings, including the solid white line and the yellow edge line, are typical for Australian roads. I am fairly confident this is in Australia, likely within a major park or botanical garden.

Country: Australia
City/Area: Perth, Western Australia
Confidence: High

then: guess