Saint Alexander Nevsky Cathedral was completed during the period when Poland was part of the Russian empire in 1884. It's a shining example of Orthodox religious architecture in Poland.

Go on a tour with Spido, one of Rotterdam’s biggest attractions. The Port of Rotterdam tour (75 minutes) sails year-round and gives you a short but powerful impression of Rotterdam’s container ports.

Perched above Bilbao on Artagan Hill, the Basilica of Our Lady of Begoña was built starting in 1511 on the very spot where, legend says, the Virgin Mary appeared. The church mixes styles: mainly Gothic inside, a Renaissance front with a grand arch, and a belfry added in the early 20th century. Inside, there’s a polychrome wood carving of the Virgin of Begoña ('Amatxu' to locals) from the 14th century. Sailors often used to name their boats after her, and every 15 August (Assumption) and 11 October (Feast of Begoña), the place fills with pilgrims.

The Guggenheim Museum Bilbao is a landmark of contemporary architecture and a cultural beacon for the city. Designed by Canadian-American architect Frank Gehry, the museum's fluid, sculptural form has been hailed as one of the most significant architectural achievements of the 20th century. Its titanium-clad curves and organic shapes have transformed the Bilbao skyline and are often likened to a ship or flower. Beyond its jaw-dropping exterior, the museum houses a world-class collection of modern and contemporary art, focusing on postwar American and European artists. Notable works include pieces by Mark Rothko, Jeff Koons, and Louise Bourgeois, among others.