The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

The home of two of Scotland's most important artists has been reassembled in the Hunterian Art Gallery.

Erected in memory of Sir Arthur Conan Doyle, who was born close to this spot, this statue commemorates the author and his famous detective.

An exceptional engineering feat that facilitates the migration of salmon upstream during their breeding season.

A pagan tradition of draping trees with rags eerily lives on.

This memorial was created by an Irish nurse who lived in New York City during 9/11.

The pub has been in operation since 1819 on the banks of the Clyde.

Once the overnight home of Mary Queen of Scots.

This abandoned bridge over the River Irvine may be the oldest surviving railway viaduct in the world.

The television series' iconic giant foot was borrowed from this classical painting.

A mysterious shape catches the eye in this 16th-century painting.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This castle was first occupied in the 1400s and has undergone major restoration in recent times.

This former World War II artillery defense site was built to guard the industrial city of Glasgow.

This 19th-century prison once held Irish revolutionary Constance Markievicz, writer Frank O’Connor, and a nine-year-old pickpocket.

The initials "GW" mark where one of Scotland's most important Protestant martyrs was burned at the stake.

This Georgian mansion blends historical significance with an impressive art collection within picturesque surroundings.