Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

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

Home to the world’s oldest seismograph and a four-ton steel ball that makes its own earthquakes.

Stone slabs along the coast warn of Japan's tsunami-ravaged past, often marking the highest point of a wave's reach.

Left by the Devil, an ancient quarry or just plain old erosion, this enigmatic rock pillar rises 28 feet from the hillside.

This hilarious English intersection is an automotive whirlpool.

A century-old tradition has culminated in a small but singular collection of feline effigies.

This tranquil churchyard in the heart of England’s mining country whispers tales of both triumph and tragedy.

A rotating bridge that carries a little canal over a larger one.

The view from this giant Stone Age toad is unexpectedly beautiful.

There's a strange stone hoodoo towering atop a wooded hillside and no one is quite sure how it got there.

The site of one of the largest non-nuclear explosions in history, created when a massive bomb dump accidentally exploded.

The world's tallest bridge is also possibly the most elegant.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

The world's biggest floating museum in Gothenburg, Sweden.

A colossal strolling Pinocchio that was greeted with more outrage than whimsy.

Enigmatic bug-like sculptures mystify drivers along a Swedish highway.