In a quiet residential neighborhood, one restaurant fights to preserve heirloom corn, one tortilla at a time.

The stoutest tree in the world.

Where the lovelorn find a home for their sentimental keepsakes.

This hidden garden boasts amazing views of Lyon.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A remarkably intact castle that once was the largest in Ireland.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The silly symbol for an underground protest group is now scattered around the city.

A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.