An Australian lake whose pink hue defies scientific explanation.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

One car at a time please.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The longest and tallest aqueduct in Britain can actually be sailed across.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.