A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This castle has links to Portugal’s founding and struggles for independence.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

This Western Australian mint was established during the height of the Australian gold rush.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A massive Montreal stadium that has seen nothing but trouble since its inception.

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

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

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.