Australia's largest collection of rare and bizarre insects.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

100-windowed castle turned art gallery, built by one dedicated mason.

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.

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

A long-abandoned provincial prison left to crumble in the frigid air of Ontario.

An exhibit of endangered species confiscated from smugglers and passengers.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

This rickety old shed hides a trove of secondhand literary treasures.

Amsterdam's Red Light District leaves little to the imagination.

Where royalty waits in the height of luxury.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A curious collection dedicated to human and animal anatomy and pathology.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Museum preserving torture methods from the past.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Once the foundation for a mansion, these ruins now offer amazing panoramic coastal views.