This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

On a teardrop-shaped island in the Danube, the ruins of a convent and the final resting place of a saint.

Mysterious texts covered in mystical symbols were found in caves at this site centuries ago.

This building has survived for more than a century and remains virtually untouched.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

This hidden art nouveau gem was designed by an architect in search of a national style.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

This stately bank building hides a spectacular star-studded ceiling.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spain's largest bullring offers a unique glimpse at architecture and history.

The final resting place of the great navigator, or maybe his brother.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

A 16th-century Andalusian palace.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The world's largest wooden structure.

Gargoyle head that brings good luck.

An ancient knight and a symbol of the city's freedom.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

A World War II evacuation tunnel turned into a history display of Croatian state and people.