The modern birthplace of Irish freedom.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The final resting place to 300 Victorian-era pets hides inside the city park.

A 18th century graveyard and its astonishing cortege of macabre iconography.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Hear the quietest sound from across the dome.

A student driver's nightmare.

A hands-off space for graffiti artists to hone and display their skills.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.