Helsinki Cathedral hosts Helios until 1 November

Helsinki Cathedral (Helsingin tuomiokirkko) is hosting Luke Jerram's Helios in Helsinki until 1 November 2026. The seven-metre artwork and its related family space adventure give the Finnish capital a current cultural event inside one of its best-known buildings.

Helios remains at Helsinki Cathedral until 1 November

The presentation runs from 1 October to 1 November 2026 at Helsinki Cathedral, Unioninkatu 29, according to the cathedral's event listing. Helios is a detailed scale model of the Sun by British artist Luke Jerram, installed inside the church rather than in an outdoor square or gallery.

The accompanying family space adventure uses the artwork for space-themed questions and creative activities. MyHelsinki describes a shorter route at the cathedral and a longer route linking the cathedral with the Old Church. Some activities are located in the Cathedral Crypt, making the programme more than a single viewing of the suspended artwork.

The event page also places the presentation within the cathedral's October programme. The official listing confirms the period ending on 1 November 2026, so the installation remains relevant to visitors in Helsinki on 31 October and on the following day.

the cathedral event listing carries the presentation dates and venue. The family activity and its two route options are set out in MyHelsinki's programme description.

Luke Jerram's Sun meets Engel's Senate Square church

The installation is placed in a building completed in 1852. Helsinki Cathedral was designed by Carl Ludvig Engel as part of the Empire-era centre around Senate Square, with later work by Ernst Bernhard Lohrmann. Its plan forms an equal-armed cross, while the central dome rises more than 80 metres above sea level.

That architecture changes how the event is experienced: the artwork's spherical form is set against a neoclassical interior designed around symmetry, height and strong axial views. The family activity therefore connects a contemporary model of the Sun with the historic space that has served Helsinki's diocese since the nineteenth century.

The cathedral is the main church of the Helsinki Cathedral Parish and the Helsinki Diocese. It remains an active church for worship and concerts, while the crypt provides a separate setting for exhibitions and parish activities. The background and architectural details are confirmed by the Helsinki parish history page.

Visiting Helsinki Cathedral: what travellers from Western Europe should know

• The Helios presentation runs from 1 October to 1 November 2026 at Helsinki Cathedral, Unioninkatu 29, 00170 Helsinki.
• The family space adventure is available during October, with some activities placed in the Cathedral Crypt and a longer option connecting the cathedral with the Old Church.
• The building stands beside Senate Square in central Helsinki, giving visitors the Unioninkatu address as the clearest location reference.

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Frequently asked questions about Helsinki Cathedral

When does Helios take place at Helsinki Cathedral?

Luke Jerram's Helios is presented from 1 October to 1 November 2026 at Helsinki Cathedral in Helsinki.

What is the family space adventure at Helsinki Cathedral?

It is a family activity linked to Helios, with space-themed questions and creative tasks. Visitors can choose a shorter cathedral route or a longer route connected with the Old Church.

Where is Helsinki Cathedral and how do you get there?

It is at Unioninkatu 29 beside Senate Square in central Helsinki. The address places the cathedral within the city's Empire-era centre.