4Aqueduct of Segovia, Segovia

Dating back nearly 2,000 years, the Roman aqueduct of Segovia is a breathtaking reminder of ancient engineering genius. Stretching for more than 15 kilometers, with over 160 arches, it was built without mortar—its granite blocks held together by sheer precision.

Towering above the city’s plaza, the aqueduct remains one of the best-preserved Roman monuments in Europe. Its timeless grandeur proves that great architecture can endure across millennia.