A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

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.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

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

The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

There's something in the air as history repeats itself at this museum dedicated to the Swedish pop band.

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

It houses the remains of a 17th-century version of the Titanic.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A 15th-century monumental Latin inscription on this house celebrates Lorenzo Manilio's love for Rome.

Rome’s legendary peephole vista is also a former Crusader stronghold.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Al Rahmah Mosque appears to "float" atop the Red Sea.