A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Hidden beneath the streets of London is a secret subway that only carried mail.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This 36-foot-tall bronze Lady Liberty holds a real flaming torch.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

This shrine dedicated to the Virgin Mary is also a tribute from a mother to her fallen son.

A giant piece of cutlery designed to remind us about the origins of our food.

Tucked among the sand dunes overlooking a Welsh beach, a real-life tribute to a fictional elf.

The worst flood disaster in Welsh history might have been a lot worse if it had not happened on movie night.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

The once-a-day siren is a reminder of the days before time was standardized.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

Before becoming a poet John Keats studied here to become a surgeon.

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

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

A haunting painting meant to capture the calamity of World War I.

One of the oldest remaining Catholic churches in England is home to the hand of a 7th-century saint.