Want to properly offend a king? Sculpt a giant hill figure in chalk of him riding out of town.

A ruined castle has more than its fair share of legends and ghost stories.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

Human-made caves excavated to hide a secret society of wealthy pagans.

One of Europe's oldest libraries.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Used as an example in one of the first dictionary entries for "museum" in 1706.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

Seat of the Duke and Duchess of Devonshire for centuries.

The oldest inn in England served brew to the crusaders.

Cemetery established by the Victorians as a solution to the overflowing graveyards.

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

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The modern birthplace of Irish freedom.

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.