Zagreb, the capital you read on two levels.

01 Two towns on two hills

On the heights stood two separate cores divided by a stream. Gradec, the free town of merchants and craftsmen, was granted its royal charter in 1242 and ringed itself with walls; beside it, on the twin hill, grew Kaptol, the canons' quarter, first recorded in 1094. They competed for centuries —over markets, boundaries, water— to the point that one of the streets still dividing them keeps a name that recalls those clashes. They did not fuse into a single city until 1850. When they finally joined, those two upper towns became the Upper Town, and everything built afterwards, down the slope, formed the Lower Town.

02 The Upper Town, lit by hand

Climbing to the Upper Town means changing century. The streets are short, cobbled and quiet, and at dusk something happens that almost no European capital still keeps: a lamplighter walks the lanes on foot and lights by hand, one by one, more than two hundred gas lamps that have burned every night since the mid-nineteenth century. Above the roofs rises the Lotrščak Tower, standing since the thirteenth century, from which a cannon fires every noon —a habit more than a century old— to mark the hour for the whole city. Here time is not checked: it is heard, and lit.

That Upper Town keeps its most recognisable crowns in plain sight. The roof of St Mark's Church is a nineteenth-century mosaic of glazed tiles, a board of colour that caps the silence of the lanes and has become the quarter's most repeated image. You need not step inside anywhere: the Upper Town is understood by walking it slowly, looking up, letting the stone and the gas set the pace.

03 The hinges: funicular and market

Between the two levels sit two pieces that work as hinges. One is the funicular, opened in 1890: barely half a minute along one of the shortest and steepest stretches in Europe, closing in one go the gap between the shopping street below and the promenade above. The other is Dolac, the open-air market opened in 1930 right over the point where Gradec and Kaptol once met. One moves people between floors; the other moves food between the countryside and the city.

Dolac is the other hinge, and the most eloquent one: it was built over the old boundary between the two towns, as if the market had come to stitch together what history had kept apart. Its red parasols cover a board of fruit and vegetable stalls that each morning brings the rural world into contact with the urban one and empties out by around one o'clock. Below, a covered level holds the dairy and the flowers. The market is neither up nor down: it sits exactly on the join.

04 The Lower Town in a grid

At the foot of the hill, the Lower Town tells another story. It was laid out in the nineteenth century with the logic of the Austro-Hungarian Empire: regular blocks, wide avenues and a grid that links landscaped squares into a horseshoe. Where the Upper Town winds and climbs, the Lower Town orders itself and stretches out. Ban Jelačić Square, on the hinge between the two, is the point where the two logics meet: you leave the medieval maze and step, in a single stride, into the nineteenth-century grid.

05 What Zagreb leaves you

What you take from Zagreb is not a monument but a seam. Few capitals show so clearly that they were never meant to be one thing: here, divided by a slope, live the city that is lit by hand and the city that is ordered in a grid. When you step off the funicular and the bustle of the market replaces the silence of the lamps, you understand that Zagreb is not crossed sideways but vertically: you do not change neighbourhood, you change era.