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

Get in line for Lisbon’s most famous sandwich.

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

This abandoned five-star hotel is now a five-star urban exploration destination.

Europe's oldest still-operational tea farm also boasts a spectacular view.

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

Bits of flat terrain surrounded by cliffs make one of the most beautiful landscapes in the Azores.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Tens of thousands of tiny bottles stuffed with various items.

The people murdered during a 17th-century Norwegian witch hunt have been honored with a pair of stark, modern installations.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A musical instrument played by the sea.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

A fantastical bed and breakfast with magically unique rooms.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

One of the deepest indoor swimming pools in the world.

This modern arts center is built around a gem of late-Baroque architecture.

Medical history with an amazing, if frighting, collection of wax diseases on display.

This abandoned Belgian fortress is purposefully being left to nature.

Hiding the longest subterranean river known in the world.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Climb inside an iron crystal magnified 165 billion times its normal size.