Which famous landmark was opened to the public on the 1st of November, 1512?

swish, that's right, he was threatened with excommunication and banishment, which meant your dead really.

The Vatican (City) has been around since 1st century. Taj Mahal built in 1600's. Buckingham House/Palace started in 1500's (I think) but has been torn down or renovated or greatly changed a few times since then, and probably wasn't just opened to the public in 1521.

when Michelangelo was finished the pope said: when I said paint the ceiling i meant blue