The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

Descend into the tunnels to experience the life of a coal miner.

Incredible labyrinth of man made caves.

A beautiful maze marks where three countries meet.

I Street Bridge is the heaviest swinging center bridge in the United States.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A Masterpiece with a Tragic History.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

The struggle of a small Dutch island against the sea.

Home to the world's oldest functioning orrery.

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

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

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

A bigger-than-life pun that has become a beacon of altruism.

The biggest museum dedicated to insects in North America, one of the largest in the world.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The only arched bridge made of stone on the entire Mississippi River.

Venice's island of the dead.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The most loyal of little dogs, or a Victorian era publicity stunt?

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.