Geometry

Castel dell'Ovo, a historic landmark in Naples, Italy, is seen from the rocky coastline as waves crash.

A motorcyclist and cyclist on a road curve, enjoying the warm day.

A scenic view of the Grand Canal in Venice, Italy, with gondolas and historic buildings lining the waterway.

Illuminated building reflected in the water at night with a wooden bridge in the foreground against a dark blue sky.

People relax by the waterfront in Marseille, France, with buildings and boats in the background.

People walk up stone steps on a narrow European street with shops.

People stroll on a city street near a marina, enjoying a leisurely walk on a bright day.

A black and white photo of people crossing a city street in front of Bahnhof Potsdamer Platz in Berlin.

Roberta C.