This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

The Swedish flag over this small naval fort signals that the nation is at peace.

At low tide, you can see the remains of a 17th-century ship just off a Stockholm island.

Stockholm's deepest subway station is also a stunning ecological wonder.

Sweden's "good old days" painstakingly re-created in a model village.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A haven for book enthusiasts across the street from Retiro Park.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

Atop this library is one of the most beautiful green spaces in Warsaw.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

The final resting place for the remains of 143 Habsburg royalty.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

This sprawling market is a one-stop shop for traditional Kazakh foods, from mare’s milk to sheep’s head.

Beatlemania is still going strong... at least in Kazakhstan.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

Once a luxurious flagship of the Soviet Union, this Brutalist structure remains a landmark of Tashkent’s communist past.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

Ancient barriers wrap around what was once an important stop along the Silk Road.