An exquisite tunnel of cascading flowers.

This free, take-a-book shop seems like a trick but isn't.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

A giant portrait of an ancient king looms over the river.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

A Dutch museum preserves the world's most diverse collection of vertical slices of soil.

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

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

A market built atop boats is one of the few floating holiday markets in Europe.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

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

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

This fairytale-like structure is the last turf church ever constructed in Iceland.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Theme park featuring miniature replicas of European monuments.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Centuries later, the victims of Great Britain's greatest hysteria are finally being remembered.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.