These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Charles Babbage's proto-computer, painstakingly brought to life.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

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

This basement museum explores the art and artistry of fascism.

The former headquarters of history's oldest megacorporation.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

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

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

A charmingly eccentric magma chaser presents his complete history of the island's eruptions since 1947, in cinematic form, just for you.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.

This historic streetcar system has been running since the 19th-century.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.