This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Rippling sand dunes frozen in the Arizona rock.

A psychedelic labyrinth on the San Francisco bay.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

This sidewalk tribute honors Colorado's great culinary creation.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A historic observatory precariously perched at the "Top of Europe."

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.