Vatican City

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Michelangelo's The Madonna della Pietà (1498-1499) - cannot be sold

A portion of the Sistine Chapel ceiling shows the Creation of Adam (1508 -1512) - cannot be sold

Castel Sant'Angelo and Bridge of Angels over the River Tiber The 'castle' was originally built as a mausoleum for Hadrian but his remains are no longer in the castle.  It is linked to Vatican City by an elevated passage (Passetto).