I like many buildings from around the world but I think these are my favourite:

Crescent House:

The crescent house is an house of Ken Shuttleworth a famous architecture. It i shaped like two crescents from birds-eye view and it has really long windows about twenty-four metres long!

 

Marina Bay Sands

This building or buildings were really cool when I saw it in Singapore it had 3 buildings with a very long boat at the top of it. The Boat was the casino and the buildings were a hotel (five star hotel).