The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Op-art architecture designed for happiness.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The beautiful baroque library of the Hapsburg empire.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

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.

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

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

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

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.