Westminster Abbey is absolutely worth visiting inside, as it is less of a church and more of a national mausoleum and history museum. Since 1066, every British monarch has been crowned here, and the interior houses the Coronation Chair, one of the most significant pieces of furniture in the world. Walking through the Abbey, you are literally walking over the graves of over 3,000 notable figures, including Charles Darwin, Isaac Newton, and Stephen Hawking in "Scientists' Corner," as well as Geoffrey Chaucer and Charles Dickens in Poets' Corner. The Lady Chapel, with its breathtaking fan-vaulted ceiling, is an architectural masterpiece of the 16th century. In 2026, the Abbey remains a working place of worship, and visitors are often moved by the "Unknown Warrior" grave near the entrance. While the entry fee is significant (approx. £29), the depth of British history, the stunning Gothic architecture, and the sheer density of legendary figures buried within its walls make it a "must-see" that no exterior view can replicate.