Deadliest lake in the world suffocated over 1,746 people in one night.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

This former coal gasification plant found a curious second life as a popular public park.

One of the best preserved Tudor public buildings in Britain was once used for witch trials.

This ingenious engineering solution was built to stop the "theft" of canal water.

The obelisk honors the cyclist troops who were killed during World War I.

A gigantic mechanical bull rages over unsuspecting passengers at Birmingham’s central station.

The small Scottish townhouse where the "Father of the National Parks" was born.

A watchhouse constructed from tombstones, to make way for a burial pit, for the victims succumbing to a deadly disease.

A poignant memorial shows the widows and children left heartbroken by the worst fishing disaster in Scottish history.

This meticulously reconstructed early medieval settlement offers an immersive experience of daily life in an Anglo-Saxon community.

Lord Byron's embalmed body lies within this medieval church.

This memorial honors the first British soldier killed by enemy action on home soil during World War I.

This sculpture honors a long-beloved English comic strip in the main character's hometown.

Unusual British home built to disguise a water tower.

This massive metal scallop is a tribute to an English composer who once walked across this beach.

This Scottish bay still reveals evidence of its days as a seaside swimming pool.