The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

A tiny church on a man-made island in the Adriatic.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

Perhaps the most spectacular grotto along the Algarve coastline.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An ancient capital city that dates back 3,000 years and harbors many surprises.

The world's first and only escalator for lazy bicycles and their daunted riders.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

The most powerful waterfall in all of Europe.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This seven-sided Romanesque chapel is regarded as the oldest building in Rovinj.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.