The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

This automated sculpture of two men peeing will spell out text messages with their micturition.

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

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Macabre astrological automaton clock dating to the late 1400s.

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

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

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."

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

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

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

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

Fortified homes of highland warriors that are still in use today.

The first skyscraper to include a Ferris wheel built into the facade.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.

This deceptively salty lake looks like blushing pink lemonade.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

New Zealand's only running funicular railway.