Today's busy Cathedral, the fourth to grace this particular site since 604 AD, is still of major importance for religious worship. However, it also stands as a man-made symbol of hope and resilience because the cathedral has, throughout history, been bashed about a bit. The lead architect, Sir Christopher Wren (who is entombed in the crypt beneath), rebuilt it several times, including when it was partially, but not completely, destroyed during WWII and the Blitz.

However, saving the outstanding feature of St. Paul's till last, one that really pulls in the crowds, is its dome. It's bulbous and grey from the outside, a space of acoustic phenomena on the inside known as the Whispering Gallery, and accessible via a series of steps.

Once up there, you and a partner stand at opposing edges of the dome and whisper into the walls. The sound will travel across the roof to where your partner is standing, and they should be able to hear you clearly. Just remember it's a 'whispering' gallery, not a 'bellowing' gallery; you don't want to deafen your friend or relative.

Opening times: 08:30 - 18:00

Prices: Adult: £14.50 - - Concession: £13.50 - - Children (6-18): £5.50 - - Family (2 adults, 2 children): £34.50

Location: At the end of the Millennium Bridge, across the river from the Tate Modern

Nearest Tube: St. Paul's (Central Line)