This pedestrian walkway cuts through a cemetery and over several burial vaults.

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

A mysterious Castle is now home to a rare breed of goat.

One of Europe's oldest libraries.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Hidden beneath the streets of London is a secret subway that only carried mail.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

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

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

A moody and picturesque riverside ruin overgrown with vegetation.

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

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A plaque in Madrid’s West Park marks the launch of a queer icon’s unlikely media career.

Once a resting spot for King Fernando VII.

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

Five million people are laid to rest here, more than the population of Madrid itself.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.