This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

The place where World War I began.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Bridge that died in war and was resurected.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This former quarry is now a picturesque gorge that hides a sunken lake.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

A monument to the small town of master violin makers and its countless luthiers.

Visitors flock to the historic birthplace of radiobalneology for its therapeutic radium treatments.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

This collection of Neolithic monuments make up one of The U.K.'s richest archeological landscapes.

Every St. Andrews student knows to avoid this inscription for fear of a martyr's curse.

A distinctive building that incorporates a mythical beast into its architecture.

A well-traveled statuette of a much-beloved village icon.

A single oak tree rises out of the waters of Loch Lomond.

Dedicated to one of the nation's worst engineering disasters.

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.