The largest retailer of seashells in the world.

This small island was the first National Wildlife Refuge ever created in the United States.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

The oldest house of worship in Palm Beach has a wonderful tropical garden.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

An early 20th-century bullring converted into a modern shopping center.

This postmodern apartment block was designed to be a vertical neighborhood.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

The oldest Roman lighthouse still in use.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

This massive home was constructed by one of the greatest conservationists in Colorado history.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

A castle-inspired apartment building that has stood in Birmingham since 1927.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

This park contains a number of standing stones meant to heal and inspire.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

This monument claims to display the first pot used to cook a famed Southern stew.

A surprising collection of bronze faces beneath a bridge in Loveland.

This large, circular tomb is the final resting place of the first emperor of Rome.