It's over a decade old, but Roppongi Hills remains the gold standard for real-estate developments in Tokyo. The centrepiece of the office, shopping, dining and entertainment complex is the 54-storey Mori Tower, home to the Mori Art Museum and Tokyo City View observatory. Scattered around it is public art such as Louise Bourgeois’ giant, spiny Maman spider sculpture and the benches-cum-sculptures along Keyakizaka-dōri, as well as the re-created Edo-style Mohri Garden .