This place was a truly hidden gem that blew my mind.
Only about 20 miles NW of Madrid but there are no trips from the capital. Nearby is a small village but there are no signposts and no advertising. No public transport you have to drive.
We arrived mid morning on a huge car park with just 1 other car present. Most obvious is the world's tallest christian cross on top of a hill. To enter the basillica you have to go through airport type security. It's been carved out of solid rock into the side of the hill and amazingly it's bigger inside than St Peter's in Rome. There only 2 other people present.
It used to be a very popular attraction but a few years back the government closed it. There were calls for it to be blown up! It has reopened but it's future is still under scrutiny.
Why all the security and lack of popularity. It's Franco's tomb (his body has been removed.) He is still revered by many but loathed with a passion by most Spaniards. All that aside it's a truly awe inspiring piece of architecture.
https://en.wikipedia.org/wiki/Valley_of_the_Fallen