Hadrian's temple to the gods, the Pantheon in central Rome is extraordinarily well-preserved. Visitors stand inside and gaze up at the skies through the oculus, the nine-metre hole in the dome, then pay homage at Renaissance artist Raphael's tomb.
Remaining almost intact to the present day, Rome's Pantheon has been used throughout history as a temple, before being converted into a Christian church in the 7th century, and then into a tomb during the Renaissance period.
There are several bodies buried here, including those of painters Raphael and Annibale Caracci, and kings Vittorio Emanuele II and Umberto I.