It's possible to walk inside one of the largest Neolithic tombs in Britain.

The 20-mile causeway that separates the Netherlands from the sea.

A decomissioned facility where the German "Transrapid" maglev trains were once tested.

There are two dozen tanks just sitting in an open field in Lower Saxony.

A farm turned upside down.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

A solemn memorial in a majestic setting that honors a 1692 tragedy.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A close look reveals that the Scottish monument is just slightly off-kilter.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

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

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A remarkable feat of Victorian engineering across the Firth of Forth.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

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

A unique underground structure dating back to the 1st century BC.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.