Approximately 65,000 gallons of crystal clear water pour out of this headspring every minute.

This replica of a 16th-century French settlement memorializes one of the earliest attempts at a European settlement in North America.

Used as a military post in three different engagements, this fort has remained incomplete and unfired upon for nearly 200 years.

This shrine commemorates the site of the first known Catholic mass in the United States.

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

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A building so large that it has its own weather.

In a time before lifeguards, this house was a sanctuary for the shipwrecked.

A mysterious castle built as a monument to lost love.