The largest and best preserved necropolis in the Western Mediterranean.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Nestled in the woods lies this land art project: a hybrid between park, maze and natural monument.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

The world's first interactive human body museum also serves as a chair for a giant orange man.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

A floating cat sanctuary on an Amsterdam canal.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

The birthplace of most all of Europe's space missions is here on the Dutch coast.

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

A beautiful maze marks where three countries meet.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This Funeral Hearse Museum represents the finest in cadaver transportation.

A stately palace has been converted into the world's largest cannabis museum.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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

Religious dwelling in a Spanish volcano.

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

This cemetery features modernist statues as strange as its name.

This semi-secret storybook hedge maze is also the oldest garden in the city.