The secret medieval communication system will whisk your words above the noise of the crowd.

Locals believe this abandoned ruin on the outskirts of Bucharest is haunted.

This sculpture used famed boxer Joe Louis as the inspiration behind its body.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

This historic fountain is a favorite neighborhood meeting point.

A lush indoor jungle fills this bustling Madrid transportation hub.

Commonly acknowledged as the only public monument to the Devil himself.

A haven for book enthusiasts across the street from Retiro Park.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Built to celebrate the glory of a new queen, this forgotten monument has moved around Madrid three times, reflecting 200 years of political whims and city redevelopment.

This Copper beech tree nestled on a nature reserve is host to a bevy of autographs from Irish literary icons.

For more than two centuries, this family-run establishment has been serving up some of Ireland's best oysters.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

This fortress-like monastery is covered with intricate frescoes.

This metro station doubles as an unintentional paleontology museum.

An oddly conical beacon perched atop beautiful Irish cliffs.

Horse cemetery on the grounds of Blarney Castle.

France's most famous cemetery, with some of its most curious tombs.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Fantastic views and thousands of love locks.

This ordinary street was made infamous by a legendary visit from the devil.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.