Started as a kitchen garden, now the second largest botanical garden in the world.

A hidden world of exotic succulents and cacti.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

Lavish royal estate punctuated with heated greenhouses.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

Curious cave that stays a cool 56 degrees all year long.

The largest greenhouse in the world is home to over one million types of plants.

Stroll through a wonderland of stupendous moss-covered trees.

More than five miles of underground passageways.

Isaac Newton's former home, where the famous apple tree still stands.

A 30-acre garden inspired by the principles of modern physics.

Cold storage for agricultural biodiversity.

Giant topiary dog once played a role in a terrorist bomb plot.

The longest hedge maze in the world.

Unicorns, elephants, and bears, oh my!

An ordinary pond with fish from out of this world.

The sign at the garden gate reads: "These Plants Can Kill."

The world's largest bioluminescent area was undiscovered by science until 2005.

A white oak with property rights.

Impossibly life-like natural history models created out of glass by a father and son.

Elevated freight railway turned wildly successful urban park.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.