This World War II relic let Allied pilots know they were entering neutral airspace.

This Victorian-era walkway is just one of the many 19th-century treasures in Whitehead.

These huge glacial erratics are humorously named after a much much smaller bird.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th century.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

The name Niarbyl means “the tail” and refers to the rocky formations that push out into the Irish Sea.

This unique rock formation has become a popular walking trail.

The ruins of an unfinished explosives factory can be found while taking a gentle stroll through a Manx glen.

This bronze statue was dedicated to a 1966 Beatles hit.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

A 12th-century Italian skirmish gets reenacted with 500,000 pounds of flying citrus.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This 20th-century replica of a 13th-century castle has itself fallen into ruin.

Giant statue of a disembodied head.

Quirky outsider art transforms this garden shop into a little stone fantasyland.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

The last remaining bottle-shaped kilns in Scotland stand alone in an Edinburgh suburb.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.