Giant's Causeway in 3D: Walk Antrim's Basalt Columns on Your iPhone

On the north coast of Northern Ireland, some forty thousand basalt columns step down into the Atlantic. Here is how to walk them in 3D with live Street View, right from your iPhone.

On the north coast of County Antrim, a few miles from the village of Bushmills, a headland of tightly packed stone columns steps down into the Atlantic and disappears under it. There are something like forty thousand of them. Most have six sides, some five, a few seven, and they fit together so neatly that the surface reads as paving rather than rock.

The obstacle here is not distance. Derry is about an hour away by road, Belfast a little more, and the Giant's Causeway is among the most visited places in Northern Ireland — which is precisely the problem. Coaches arrive in waves through the middle of the day, the car park fills early in summer, and the weather does what Atlantic weather does. Wet basalt is genuinely slippery, and the sea occasionally throws a wave further up the stones than anyone expects.

All of which rewards planning, and a look at the ground before you stand on it. You can start today, in full 3D with live Street View, right from your phone.

What makes the Giant's Causeway special

Around fifty to sixty million years ago, as the North Atlantic was tearing open, enormous volumes of basalt lava flooded across this part of Antrim. One thick flow cooled slowly and evenly, and as cooling basalt contracts it cracks — the same physics that splits drying mud into plates. Here the cracks propagated downward in a regular network, leaving vertical columns with mostly hexagonal cross-sections. Where the lava cooled unevenly the columns are short and irregular; where it cooled evenly they are long, straight and almost machined.

The legend fits the geology better than most. The story has Finn McCool building a road across the sea to face a Scottish rival, then tearing it up behind him — and the same lava flows do reappear across the water at Fingal's Cave, on the Hebridean island of Staffa, in identical columnar form.

It is a UNESCO World Heritage Site and national nature reserve, looked after by the National Trust. Beyond the main promontory there are named features to find: the Organ, a bank of tall columns set into the cliff face; the Chimney Stacks on the headland above; and a boot-shaped block on the shore that the story assigns to Finn.

How to explore the Giant's Causeway in 3D

Coverage here is good from the air and along the paths, which makes it a satisfying place to walk virtually first. MAPAS gives you the coast in true 3D, so the cliffs behind the stones stop being a backdrop and become part of the structure.

For a first run, try this order:

1. Search for Giant's Causeway, Northern Ireland, and switch to 3D so the headlands and cliffs rise into relief.
2. Tilt the camera along the coast from the west to see the causeway as three promontories stepping down into the sea.
3. Drop into live Street View on the road that descends from the visitor centre and follow it to the stones.
4. Walk out onto the Grand Causeway, then turn and look back at the layered cliff behind you.
5. Climb the clifftop route and follow the coast path east toward Dunseverick, checking gradients.
6. Save the walk and use GPS navigation to retrace it when you arrive.

Beyond the stones

• Dunluce Castle — a ruined castle perched on a sea stack a short drive west along the coast.
• Carrick-a-Rede — a rope bridge strung to a small fishing island east of the causeway.
• Bushmills — the village inland, and the distillery that has been working there for centuries.
• The Dark Hedges — an avenue of beech trees arching over a country road south of the coast.
• Rathlin Island — a ferry ride from Ballycastle, with seabird colonies on the western cliffs.

Reading the cliffs, the light and the weather

A photograph flattens the causeway into a pavement. The 3D view restores two things it loses. The first is structure: the columns form three linked promontories at different levels, and the cliff behind is a stack of separate lava flows with a rust-red band between them — an ancient weathered soil, formed during a long pause in the eruptions.

The second is light. This coast faces north, so for much of the day the sun sits behind the cliffs and the stones stay in flat shade. It is the low sun of early morning and late evening, swinging round to the northeast and northwest in summer, that rakes across the column tops and shows their edges. Knowing the orientation tells you which hour deserves an alarm.

Before you go

Late spring and early autumn give the best balance of daylight and calm. Summer is busiest; winter brings short days, strong winds and real spray. Expect rain, and bring boots with grip: the wet columns are slick and uneven underfoot.

Stay well back from the water on the seaward stones, keep to marked paths, and take the closure signs seriously — sections of the clifftop route have been shut after landslips before. Leave the rock where it is. Forty thousand columns sounds inexhaustible and is not.

Common questions

Do I have to pay to see the Giant's Causeway?

The stones lie on a public right of way, and the National Trust fee covers the visitor centre, parking and guiding. Walking in from the coast path or arriving by bus is a long-standing alternative, though arrangements are worth confirming before you travel.

How long does a visit take?

An hour or so covers the walk down, the stones and the walk back. Half a day lets you add the clifftop route and the Organ, which is where the site stops feeling like a car park and starts feeling like a coastline.

Is MAPAS free to use?

Yes. It is free on the App Store, needs no sign-up before you start exploring, and works on iPhone and iPad.

The Causeway survives its own fame, mostly because the geology does not care how many people are standing on it. Arrive early, walk further than the crowd does, and it belongs to you for a while.

Open MAPAS, tilt the camera along the Antrim coast, and go and count the sides of the columns.