What are the best websites to download books?

I am an avid reader who instantly picks up a book whenever he is free. Over the years, I have built a very respectable collection of books which is quite close to my heart. However, off late, I have been thinking about switching to eBooks since it is getting difficult for me to find space for my new books.

I recently went on the internet to check out some websites offering eBooks and was left overwhelmed by their large number. So, I am here to ask you what you think are the best websites on the internet for downloading eBooks.

(Featured Image: Radio Romania Cultural)