Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

The great Danube river starts here.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

A typical crusty old museum this isn't.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A open air theatre built on a cliff by an eccentric British woman.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

Historic medieval fortified city in southwest France.