Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

A collection of short standing stones covers this hillside.

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

Estimated to be more than 5,000 years old, this yew may be Britain’s oldest.

Legend has it that this stone moves down to the river sometimes to have a drink.

In a boatyard near Aberdyfi is a nautically inspired work of art.

According to legend, this bell once belonged to a kingdom now lost beneath the waves.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Former headquarters of the KGB.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

One of the world's tallest statues is also one of its most hated.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

The world's tallest statue of a woman wields the world's tallest sword and is at risk of toppling over.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Medieval village and microminiature museum.

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

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

The summer residence of a Spanish ambassador who brought viticulture to an impoverished region, sparking its transformation into one of the world's best wine regions.

The remains of a sunken military ship wreck visible through clear water.

This 11th-century structure is one of the oldest churches in Romania.