This knick-knack-covered house (complete with a matching van) is a charming oddity in the middle of a modest downtown neighborhood.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

For over 300 years this little carving has been the city’s good luck charm.

The world's only museum devoted to the wonders of fluorescence.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

This small Milan street is filled with colorful homes and a rich history.

A larger-than-life house of cards stands outside the house of a former fashion designer.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

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

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

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

Started as a kitchen garden, now the second largest botanical garden in the world.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

No need to strap in for a "ride" on this walkable roller coaster.

This former steel and coal plant is now a neon-lit industrial fantasia.

London's old-school healing garden.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

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

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.