These formal gardens were designed to be admired from the vantage point of the castle.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

The exhibition explores the Icelandic city's Viking Age history.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This little-known national museum houses over 40,000 works of art from across the world.

Eat the ultimate iteration of Portugal's most beloved pastry.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

An early 20th-century bullring converted into a modern shopping center.

This cemetery features modernist statues as strange as its name.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A temple to modernity, tucked away amid Barcelona's more well known museums.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Once used to calculate the various levels around the country.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

This interactive museum highlights the history and philosophy of one of the world's most difficult sailing races.

A contemporary art installation housed within a Gothic cathedral.

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

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

A monument to the man who almost killed Hitler.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.