A close second...

I have a new (second) favorite building. Firmly in first place is La Sagrada Família in Barcelona, which we'll visit at the end of July. The runner up is the Palais Garnier in Paris, known by us simple folk as the Paris Opera House. I somehow missed this gem the first time I was in the City of Light. We came upon it this time as part of the Les Cars Rouge tour (a bus that makes a big circuit through the city, allowing those who buy a ticket to get on and off as they please). Maybe it's just me, but I was instantly blown away. But enough of my fawning...
Can't wait to see the inside on the next trip.