Tiny memorials honor individual victims of the Holocaust.

Cold war icon and onetime "hole" in the iron curtain.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

For centuries, Germans have been dancing in trees.

A stairway to heaven, or to nowhere at all.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

A serious museum dedicated to two German comedians.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The ghost town where the villagers refuse to leave.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

Underground monastery and fortress.

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.

These Stalin-era industrial 'death traps' hang lifeless above the city

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

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Once the home of a hermetic monk, this cave now houses a small church.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”