This colorful gate stands as an entrance to the walled city of Old San Juan.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

Cliffside houses provide a spectacular view from their perch above the valley.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

This tablet indicates where the tragic monarch returned to begin her tumultuous downfall.

Before 1993, this historic-looking village—King Charles III's pet project—didn’t exist at all.

A tiny chapel perched along a 14th-century bridge.

All that remains of the medieval palace of the famous "Black Prince."

These murals stand as reminders to the troubled history of this Northern Ireland city.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

All that remains of the only English cathedral destroyed in the Protestant Reformation.

The ruined abbey includes a rare surviving example of a monastic latrine.

This oddly placed 15th-century church is one of only six bridge chapels left in England.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

The undercroft is a spectacular example of medieval Cistercian architecture.

Built in the 1300s, this magnificent building that hosted England's kings and queens transports you to the Middle Ages.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

Artists have long been drawn to these atmospheric 12th-century ruins.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.