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

An underwater statue of Christ blesses the depths off Key Largo.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

This failed condo development was reborn as a street art hub.

An exquisite grouping of structures made from 10 tons of invasive saplings.

This underwater old Texas hill town only resurfaces during harsh drought.

A grove of colossal man-made flowers built to collect the sun's rays.