A 20th-century picture show in 3-D.

A hidden art gallery in an abandoned Warsaw fort.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Macabre astrological automaton clock dating to the late 1400s.

Ancient rock-hewn town that witnessed key events of Georgian history.

Small church on top of a huge rock column.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

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

You'll find just about anything in this funky Tbilisi flea market.

Unusual building appears to be haphazardly built from randomly piled bricks.

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.

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

A fascinating insight into daily life in the Eastern Bloc.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The most loyal of little dogs, or a Victorian era publicity stunt?

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."