Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A six-ton wedding present for the King of the Scots.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The "Prussian Versailles" that is as glorious today as when it was built.

Model Trains and Much More in Hamburg.

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

The modern birthplace of Irish freedom.

Four alabaster giants contemplate the tides on the shore of Denmark.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

This massive water spout has been luring visitors for hundreds of years, some to their death.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Medicinal spa created with the discharge from a geothermal energy plant.

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

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A mocking tribute to the past and modern leadership of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The Pope’s secret escape route.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

The final resting place of soldiers' loyal canine companions.

Northern Ireland's Brobdingnagian stepping stones.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

One of Ireland's most infamous prisons for rebels including men, women and children.