The once and future home of New Zealand's famed Pink and White Terraces.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A Manhattan office building is home to the world’s largest chess board.

San Francisco's newly reopened hands-on science museum.

The world's most active stratovolcano is almost always erupting.

Macabre astrological automaton clock dating to the late 1400s.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A marvel of Byzantine engineering under the streets of Istanbul.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A mocking tribute to the past and modern leadership of Prague.

Balconies that have a most unusual accent.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Peek through the gates at this oasis from the city, full of Old English charm.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

There are owls with glowing eyes in Herald Square.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Protecting the dead from opportunistic body snatchers.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

This historic observatory contains the world's oldest refracting lens telescope.