Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Apartment complexes built into huge repurposed natural gas tanks.

Op-art architecture designed for happiness.

Baroque celebration of the end of the Great Plague of Vienna.

This cubist Vienna church building looks like some sort of alien stonehenge.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

This 1920s Dutch barge is now a floating bookstore.

The final resting place to 300 Victorian-era pets hides inside the city park.

The curios of pharmacist and collector Henry Wellcome.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Petrified footprints of one of the very first vertebrates to walk on land.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

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

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

The oldest public library in Ireland.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.