This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

Lady Liberty's original designer installed a little clone in this French fountain.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

A cramped wooden attic that once housed one of the world's first movie studios.

The labyrinthine storm tunnels beneath the city of Melbourne are ruled by a band of urban explorers.

These mythological giants take time out of their busy day guarding a Victorian market to let you know what time it is.

Melbourne's favorite bronze dog.

A beautiful 1920s tower filled with local hidden gems.

Tiny artwork tucked within glass letterboxes form this hidden gem of an art gallery.

A colorful street named for the legendary Australian rock band.

Hundreds of tiny dead butterfly eyes gaze down at diners in this Australian eatery.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

The fantastic architectural models of a French traveler.

A modern sliver of architecture in Roma.

A fairy tale castle in modern Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A sculpture serving as an homage to Pope John Paul II.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Architectureal fantasy quarter of Rome.