Kumu Art Museum

Start with your hand on the wall, if you can reach it. The stone is cool and slightly rough, a pale grey limestone with a faint chalky feel. Nearby, a curved sweep of copper has weathered toward green. Above you, the land rises in a long natural step, and the building seems pressed into it. This is Kumu, the main building of the Art Museum of Estonia. It sits partly inside the earth, and that choice shapes everything you are about to see.

First, a small point of geography. Kumu is not inside the medieval walls of Tallinn's Old Town. It stands in Kadriorg, a leafy district a couple of kilometres to the east. If you walked or rode a tram here from the old streets, you crossed from one Tallinn into another. Behind you are cobbles and church spires. Here you have parkland, wide lawns and a building that looks firmly toward the twenty-first century.

The name itself is a short joke that most visitors miss. Kumu comes from the Estonian word for art museum, "kunstimuuseum", trimmed down to its first and last sounds. It is quick to say and easy to remember. That fits the spirit of the place. The institution behind it is much older than the building, with roots in the early years of Estonian independence after the First World War. This building gave that long-running collection a proper home.

Kumu opened in 2006. It was designed by the Finnish architect Pekka Vapaavuori, who won an international competition for the project in the 1990s. Two years after opening, the museum received the European Museum of the Year award. That honour is given for the whole visitor experience, not only for the architecture. For a small country with a modest population, it was a strong signal that Estonia's art deserved a wide audience.

Now look again at the slope behind the building. This is part of the limestone bank that runs along the northern edge of Estonia — a long, low cliff formed in ancient seas. The architect did not flatten it. Instead, he cut the museum into it, so that one side is buried in the hill while the other faces open ground. Limestone is the stone of Estonia. It sits under the fields, in old farm walls and in the towers of the Old Town. Here it returns as a modern material.

The second material is copper. On many parts of the façade, copper panels wrap the curves of the building. When new, copper shines with a warm orange colour. Over years of wind, rain and salt air from the Baltic, it slowly dulls and then turns green. So the building is still changing as you stand here. Come back in a decade and the colours will be different again. Few museums are designed to age in plain view like this.

The third material is glass, and it does practical work. Northern winters are long and dark, and summer light stays late into the evening. Large glazed openings bring that light deep into the galleries and the central spaces. Inside, you may notice how the light changes from room to room — cool and even in some halls, sharp and directional in others. It is worth pausing on the stairs and corridors, not only in front of the paintings.

What will you find inside? The heart of Kumu is Estonian art, from the eighteenth century to the present day. The older galleries show portraits, landscapes and scenes of rural life. Look out for names like Johann Köler, a nineteenth-century painter who became an important figure in the Estonian national awakening. That was the period when Estonians, long ruled by others, began to build a shared cultural identity through language, song and art.

In the early twentieth century, the mood shifts. Painters such as Konrad Mägi used intense, saturated colour to paint Estonian landscapes — lakes, islands and northern summer nights. The graphic artist Eduard Wiiralt produced detailed, sometimes unsettling prints. These rooms show a young nation testing its own voice, and also looking outward to Paris, Berlin and the wider modern art movements of Europe.

Then comes a harder chapter. For much of the twentieth century, Estonia was part of the Soviet Union. Official art had to follow the rules of Socialist Realism, a state-approved style that showed workers, leaders and cheerful progress. Kumu does not hide this period. It displays that official art alongside the quieter work of artists who pushed against the rules. This is one of the most surprising parts of the visit. You can see, side by side, what people were told to paint and what some chose to paint instead.

The upper floors usually host contemporary art and changing exhibitions. These can include Estonian and international artists, video, installation and photography. Because the programme changes often, two visits a few months apart can feel like two different museums. If something puzzles you, that is fine. Much of the contemporary work here is meant to start a conversation rather than give a neat answer.

When you step back outside, look at the setting around you. Kadriorg Park spreads out nearby, with its ponds, paths and old trees. Not far away stands Kadriorg Palace, built in the early eighteenth century for the Russian tsar Peter the Great. The office of the Estonian president is also in this area. So within a short walk, you have imperial Baroque, national government and this curving modern museum. The park ties them together.

Before you leave, stand for a moment where the building meets the hill. Listen. You may hear the wind in the park trees, a tram bell in the distance, children on the lawn. Look at the line where grey limestone, green copper and clear glass come together. That meeting of old stone and new form is the quiet idea behind Kumu. As you walk away, notice how quickly the building sinks back into the slope behind you.