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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

Tiny memorials honor individual victims of the Holocaust.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

A restaurant and observation deck built in a unique broadcasting antenna.

Berlin's old airport.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

This giant metal cross perched atop a mountain can only be reached by foot.

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

Walk through living pictures and music in the Cathedral of Images.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Hundreds of hidden passageways weave through the old quarters of Lyon.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

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

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

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An unassuming 13-acre park is home to over 12,000 roses.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A series of abstract, silly sculptures represent the works of a great modern classical composer.