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The drawing below compares five of the world's major domes. The Pantheon had the distinction of being the world's widest dome until the 20th century when modern sports arenas spanned larger areas. Second in width was the dome of the cathedral in Florence, Il Duomo. St. Peter's Basilica, though much higher than Il Duomo, was a few feet smaller in diameter. St. Paul's cathedral in London is much smaller. The United States Capitol building is the smallest of the lot. It's dome would easily fit inside several of the larger buildings, with room to spare.
The illustration above shows each of the buildings from ground level to the top of the domes. The buildings are set so that the interior floor levels of the domed areas are on the same plane. Where there are sub-floors or stairs down to ground level, those appear below the floor line.
This view distorts the true size of the domes themselves. The illustration below shows just the domes and alignes them along their own central axes. This gives a much better appreciation of the actual size of these domes compared to each other.
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