Exactly below the high altar, at the bottom of a flight of marble stairs, the Panteon Real (Royal Pantheon) is a subterranean churchyard of history.
Below the high altar is the Panteon Real.
mnli hypothesis: Below the high altar is the Panteon Real. premise: Exactly below the high altar, at the bottom of a flight of marble stairs, the Panteon Real (Royal Pantheon) is a subterranean churchyard of history.