Now harmless, this looming post struck fear into the heart of medieval troublemakers.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

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

Historic medieval fortified city in southwest France.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

Some of the smallest works of art in existence.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

Petrified footprints of one of the very first vertebrates to walk on land.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

Northern Ireland's Brobdingnagian stepping stones.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.