Hermitage Museum

I pick and choose my museums and the Hermitage is considered second to the Louvre in its scale. It's located in the Winter Palace, the royal winter home now a Museum and houses over 5 million works of art.  Someone said it would take 8 years to see every piece for one minute.  Not all the artwork is on display any way.  

Leonardo da Vinci Madonna and child

Michelangelo 'Crouchmg Figure'

'Peacock clock'

Raphael's 'Prodigal Son'

The Winter Palace