Mariners once used this prehistoric landfill as a navigational landmark.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

These mysterious ruins are hidden amid this sleepy coastal city.

A local road runs around a memorial to a teenager who died in 1860.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.