Architecture

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

One of the last functioning antique elevators in Chicago.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

This Scandinavian island is the site of the first modern observatory.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Hundreds of hidden passageways weave through the old quarters of Lyon.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

A modernist landscape of water and sci-fi concrete.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The tallest hotel in Europe.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

Home of the future Emperors of Russia.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.