The image of a cathedral to whiskies, ales, stouts, porter and brandies, listed like the names of saints around the architraves, is complete with 10 wooden booths opposite the bar.
With carved lions' and griffins' heads, lockable doors, highly polished mirrors and stained-glass windows of shells, fairies, pineapples, fleurs-de-lis and clowns, they resemble and probably still provide the same services as a confessional box.
On their walls are gunmetal plates for striking matches (now redundant because of no-smoking laws) and antique bells for summoning bar staff.
The place opened in 1849, when Felix O'Hanlon and later Michael Flanagan hosted passengers at The Railway Tavern from the then-nearby station. Flanagan's son Patrick renamed and renovated the pub in 1885.
He persuaded Italian craftsmen, who were brought to Belfast to work on the booming industrial town's many new churches, to work on the saloon after-hours.
Since it's just across the street from the Europa Hotel - a boarding house for journalists and dignitaries during the Troubles and therefore the most-bombed hostelry in Europe - The Crown fell into disrepair by the 1970s.
English poet Sir John Betjeman and other campaigners convinced the National Trust to buy the property and spend almost £400,000 to restore it to its original state. In 2007, the trust invested another £500,000.
It is the only bar (okay, "liquor saloon") the heritage body owns. The day-to-day running is leased to a craft hostelry operator.
It is a tourist attraction but I meet just as many locals nursing a pint as visitors toting a camera.
It's a museum with benefits: as well as Guinness, if you must, there are real ales from the local Whitewater Brewery. I recommend the 4.5 per cent Belfast after taste-testing its label-mates Crown & Glory and Copperhead. There's also an upstairs dining room: Irish stew or grilled ham and eggs with champ?
So on a damp and chilly (to be honest, hailing and freezing) night, the bartenders at The Crown pull pints and measure shorts as they have done almost every day for 165 years.
Apart from when the beer stopped flowing for a few days in January - the tenants of the most famous public house in Northern Ireland had forgotten to renew their liquor licence. Since 2012.
CHECKLIST
Getting there: Emirates' four daily flights out of Auckland all connect to Belfast via the airline's hub in Dubai, and code sharing with Aer Lingus from London.
Further information: See visit-belfast.com.
The writer visited Belfast with help from the Northern Ireland Tourist Board and Emirates.