The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

A museum dedicated to a Cold War era sausage.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This historic mansion was built as a symbol of love between a husband and wife.

This ancient Spanish castle sits high upon a hilltop.

One of Europe's largest supercomputers is housed inside of a disused chapel.

The encased skull that is widely believed to belong to St. John the Baptist.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

The first green space constructed on an elevated viaduct.

Statue of death tucked in the University of Medicine courtyard.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

An unusual manor of stunning beauty, born out of a crippling disease.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Regency-era excess on the English Coast.

The second largest surviving chained library is housed in this 12th century church.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

This historic franken-chapel is the oldest wooden church in the world, at least part of it.