Catacombs turned marketplace.

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

Hear the quietest sound from across the dome.

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

A student driver's nightmare.

The longest hedge maze in the world.

An unusual round church in London with a Templar past.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Famously misunderstood wonder of the ancient world

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

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

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Historic medieval fortified city in southwest France.

The oldest stone house in Paris was built by its most famous alchemist.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

World's most expensive home.

The first museum in the world devoted to sexual gadgetry.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

Steadily reminding Czechia of its past.