sky behind the tower
tower in front of sky
The sky is cloudy.
The building is tall.
The building is large.
The sun is behind the building.
a black and white photograph of Big Ben
The gothic inspired arches on a tower
bright clouds in the sky
a tall clock tower
Clock tower attached to cathedral
Very tall and ornate structure bearing clock faces
Sky full of fluffy white clouds
Very large and ornate cathedral-like building
a bit tower of a building
 a cloudy sky on the background 
tall gothic tower
a black and white photo of a city with large tower like buildings and a clock tower, against a cloudy sky