In the Scottish Highlands, this 13th-century castle ruin is hidden at the end of a farm track.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

An 18th-century religious argument etched into stone.

Twenty carved heads in Glasgow take a comical, modern twist to the medieval apotropaic, avenger of evil.

One of the first monuments dedicated to the accomplishments of the great Vice Admiral, Horatio Nelson.

This museum offers a glimpse into early 20th-century Glasgow life.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Single runway interrupted by a busy road that cuts across its middle.

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

This large torch on the Hove coastline helped Sir Francis Drake defend England from the Spanish fleet.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

These barriers stand as stark reminders of Northern Ireland's troubled past.

The last Victorian market in Belfast.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

The only monument to name all of the passengers and crew who died on the RMS Titanic.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

The profile of one ill-fated deacon was emblazoned forever on this church window during the Halifax explosion.

This historic cemetery stopped accepting bodies before many Canadian cities were founded.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

A futuristic rocket marks the spot where three borders meet.

The most impressive of Basel's three remaining city gates.

The immortal Hollywood star rests in peace in an unassuming Swiss village cemetery.