3D print Prague
The Vltava splits the city in two, and one 14th-century bridge has been the way across for most of that time. It's a natural centerpiece for a model.
Draw an area spanning both banks around Charles Bridge and you get the river, the bridge itself, the Old Town's dense, irregular medieval street grid on one side, and the rise toward Prague Castle and St. Vitus Cathedral on the other. Prague's terrain does real work here — the castle sits meaningfully higher than the river, and draping the model on the terrain mesh, rather than a flat base, is what keeps that hill from vanishing.
Charles Bridge on its own, without the wider city around it, is worth trying as a tight standalone crop — the bridge's tower gates and the long, arched span read clearly even at a few centimeters.