What's this?
corner
What's this?
steps
What's this?
stairs
What's this?
factory
What's this?
lift
What's this?
exit
What's this?
wall
What's this?
castle
What's this?
stadium
What's this?
entrance
What's this?
sports centre
What's this?
corridor
What's this?
harbour
What's this?
escalator
What's this?
hospital
What's this?
ceiling
What's this?
skyscraper
What's this?
office building
What's this?
swimming pool
What's this?
roof
What's this?
apartment building
What's this?
tower
What's this?
palace
What's this?
floor