A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Flamboyant architecture from the turn of 20th century.

A black cat protests the City Guild in Riga's Old Town.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Baroque celebration of the end of the Great Plague of Vienna.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Monument to a suicide protesting the Soviet invasion.

The resting place for anonymous victims of the Danube's dark waters.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Lavish royal estate punctuated with heated greenhouses.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Copenhagen's celebrated theme park and gardens.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This chimerical bridge/tunnel appears to dead end right into the sea.

This giant wire frame man sculpture is crouched in contemplation.

A miniature city, once ruled by the Queen of the Netherlands.

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

Home to the world's oldest functioning orrery.

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

The largest 19th century panorama in the world still in-situ.

The largest flower auction house in the world.