The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

The last four extravagant street signs of London's historic banking street.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The television series' iconic giant foot was borrowed from this classical painting.

Eighty million natural history specimens call this gargantuan museum home.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

A tribute to the women who quietly kept the local steelworks alive during both world wars.

An enormous steel waterfall is a nod to the substance that shaped Britain's Steel City.

"Holy Wisdom" overlooks the city that became its namesake.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

A gleaming white and undulating tower marks the border between Georgia and Turkey.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A museum glorifying the life of Stalin, located in the city of his birth.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.