London does not exactly hide its famous bits. The clock tower, the palace, the big wheel: they all make a fair amount of effort to be noticed.
The more interesting city often starts at ankle height, behind a church door or beneath an office building. These are the odd corners, forgotten fragments and wonderfully specific places that reward a detour.
Every entry below tells you exactly where it is, whether it costs anything and whether you need to plan ahead. We only link to visitor information when it is genuinely useful; for a street detail, directions are the useful bit.
At a glance
| Type of discovery | What you will find | Number |
|---|---|---|
| Hidden in plain sight | Street art, secret architecture and a clock with a man inside | 6 |
| Strange history | Roman remains, odd rituals and an ancient stone | 6 |
| Unusual residents | Pelicans and one very overstuffed walrus | 2 |
| Unexpected places | Gardens, temples and brilliantly peculiar museums | 7 |
Strange history
07. A Roman arena beneath an art gallery
The remains of London’s Roman amphitheatre were discovered during redevelopment in 1988. Inside Guildhall Art Gallery, low-lit ruins and a glass floor make ancient Londinium feel unexpectedly close.
Where: Guildhall Art Gallery, Guildhall Yard, London EC2V 5AE
Cost: Free admission; booking encouraged but walk-ins are accepted when possible.
Booking: Not normally required.
Get directions on Google Maps
08. Roman London under a working church
All Hallows by the Tower has Roman remains in its crypt and a history stretching back to the seventh century. It is a working church, so access and opening arrangements can change around services.
Where: Byward Street, London EC3R 5BJ
Cost: Donations welcome; check access before travelling.
Booking: Not normally required.
Get directions on Google Maps
09. A ruined church that became a garden
Bomb damage left St Dunstan in the East roofless after the Blitz. Instead of rebuilding it as a church, the City made a public garden among the Gothic walls, palms and climbing plants.
Where: St Dunstan’s Hill, London EC3R 5DD
Cost: Public garden; opening hours vary seasonally.
Booking: Not normally required.
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10. A fire memorial designed as a scientific instrument
The Monument marks the Great Fire of London, but Christopher Wren and Robert Hooke also designed its hollow column for experiments. It never became the observatory they imagined, though the scientific ambition is part of the story.
Where: Monument Street, London EC3R 8AH
Cost: Exterior is free; climbing the Monument requires a ticket.
Booking: Not normally required.
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11. The Tower’s nightly lock-up
The Ceremony of the Keys is the Tower of London’s nightly locking ritual, performed for centuries. It is not a casual walk-in spectacle: places are limited and the Tower’s own booking information is the only sensible source of truth.
Where: Tower of London, London EC3N 4AB
Cost: Ticketed event; book well ahead.
Booking: Required or strongly recommended.
Get directions on Google Maps
12. The boulder that outlived the city around it
London Stone is a modest fragment of limestone with a spectacularly long paper trail. Its original purpose is unknown, which has invited centuries of legend; the documented fact is that it has been a civic landmark for a very long time.
Where: 111 Cannon Street, London EC4N 5AR
Cost: Visible from the street.
Booking: Not normally required.
Get directions on Google Maps
Unusual residents
13. The pelicans with a royal address
Pelicans have lived in St James’s Park since 1664, when a pair arrived as a diplomatic gift. They are free to roam, but usually stay close to the lake and are better viewed with patience than chased for a photograph.
Where: St James’s Park, London SW1A 2BJ
Cost: Free public park.
Booking: Not normally required.
Get directions on Google Maps
14. The famously overstuffed walrus
The Horniman’s Victorian walrus is beloved precisely because its taxidermy is so exuberantly wrong. The museum explains that the taxidermist had never seen a living walrus and filled its folds with too much stuffing.
Where: 100 London Road, London SE23 3PQ
Cost: Museum admission is free; some exhibitions or activities may charge.
Booking: Not normally required.
Get directions on Google Maps
Unexpected places
15. A tropical greenhouse inside Brutalism
The Barbican Conservatory is a lush counterpoint to the concrete estate around it, with thousands of plants and ponds beneath the glass roof. Public opening hours are limited, so do not assume it is open whenever the Barbican is.
Where: Barbican Centre, Silk Street, London EC2Y 8DS
Cost: Free entry during public opening times; timed access can apply.
Booking: Not normally required.
Get directions on Google Maps
16. The house where every surface has a secret
Sir John Soane’s former home is packed with antiquities, mirrors, models and paintings, including moving panels in the Picture Room. Entry is free, but its rooms are narrow and capacity is deliberately limited.
Where: 13 Lincoln’s Inn Fields, London WC2A 3BP
Cost: Free walk-in entry; waiting is possible and groups need arrangements.
Booking: Not normally required.
Get directions on Google Maps
17. A library and museum with a taste for the unusual
Wellcome Collection explores health, medicine and what it means to be human through exhibitions, reading rooms and events. The programme changes, so check what is open instead of assuming an old exhibition still exists.
Where: 183 Euston Road, London NW1 2BE
Cost: General entry is free; events can vary.
Booking: Not normally required.
Get directions on Google Maps
18. A Roman temple under Bloomberg’s offices
London Mithraeum presents the remains of a Roman temple discovered on the site, with a carefully staged light-and-sound interpretation. It is free, but timed tickets are released by the venue and are worth arranging.
Where: 12 Walbrook, London EC4N 8AA
Cost: Free timed entry; booking recommended.
Booking: Required or strongly recommended.
Get directions on Google Maps
19. The memorial garden for the outcast dead
Crossbones Garden marks a burial ground associated with people excluded from consecrated parish burial. It is a memorial space, not a theme attraction, and its opening arrangements are set by the community group that cares for it.
Where: Redcross Way, London SE1 1TA
Cost: Free; check opening hours.
Booking: Not normally required.
Get directions on Google Maps
20. An Arab Hall in Kensington
Leighton House was the home and studio of Victorian artist Frederic Leighton. Its Arab Hall, tiled and gilded around a small fountain, is deliberately theatrical and far stranger than its quiet Kensington street suggests.
Where: 12 Holland Park Road, London W14 8LZ
Cost: Paid admission; check current tickets and opening times.
Booking: Not normally required.
Get directions on Google Maps
21. A candlelit time capsule in Spitalfields
Dennis Severs’ House is an immersive historical artwork set across a Georgian townhouse. Visitors move quietly through candlelit rooms, so this is for people who enjoy atmosphere more than conventional museum labels.
Where: 18 Folgate Street, London E1 6BX
Cost: Ticketed entry; advance booking is normally needed.
Booking: Required or strongly recommended.
Get directions on Google Maps
A note on legends
London is exceptionally good at attaching a dramatic story to a small object. When a detail is documented by an official or institutional source, we say so. When the origin is uncertain, as with the Philpot Lane mice, that uncertainty is part of the appeal. A mystery is more fun when nobody pretends it has been solved.
Explore more unusual London
Pair these detours with our free self-guided walks, use the free London museum finder to build a rainy-day route, or check free events in London before you go. For a first trip, read our 30 things tourists wish they knew earlier too.