This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

One of the world's most complex timepieces.

Swiss vineyards in a UNESCO heritage site.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

Large Hadron Collider and the Birthplace of World Wide Web.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Scattered throughout London are ancient remnants of the city's former bounding wall.

An unusual round church in London with a Templar past.

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

One part local history, 99 parts gruesome haunted house.

London's smallest police station is barely the size of a phone booth.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A garden in Lisbon filled with giant porcelain creatures.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.