Singapore Trivia

These are photos I took in Singapore earlier today; each buildings has a similarly scaled circulation spaces that makes their functions seem interchangeable. Can you match each lettered photo with the following functions, listed alphabetically:

- Airport
- Convention Center
- Shopping Mall
- Transportation Hub



Answers will be posted tomorrow.

Update: Here are the answers:
A - Changi Airport
B - Shoppes at Marina Bay Sands
C - Marina Bay Sands Expo and Convention Center
D - Entrance to SMRT (subway) next to airport